Best simple magic trick I've ever seen, blows people's minds:
Cut out a piece of black paper the shape of the opening of a beer can, lick it and stick it to the lid. From a distance it should look like it's open. Prick a hole in the side with a pin and drain out a quarter of the beer, enough that you can squeeze the can and bend it. Lay it on its side on a table, with the pinhole pointing up so it doesn't leak. Now it looks like an open, empty, crushed can. Do all that secretly obviously.
Now ask someone if they want a drink, and point out the "empty" can. Pick it up and cover the pinhole with your finger, then subtly wave the can around as you magically summon more beer. The remaining beer will fizz up and the pressure will cause the can to inflate and uncrush itself. Secretly remove the black paper and hide it. Show them the magically restored lid, crack it open an pour the beer into a glass (so they don't notice it was partly empty).
What makes it so incredible is you never hid the can from them or did anything tricksy. From their POV, an empty can just refilled itself in front of their eyes.
Edit: Here's David Blaine doing it for some obvious actors. You will be able to make it more convincing than this. Can't believe David Blaine was so popular back then lol https://www.youtube.com/watch?v=CUTG-MIqU-Q
If you can solve a Rubik's cube, normal people will think you are a genius. On the other hand, actual cubers correctly assess that I am a dumbass if they see me do it.
To be fair, this is how most skills are in the internet era. It makes it way too easy to feel like you're not good enough just because it's so easy to find content from highly talented people.
I've learned how to solve in 3 minutes or less since the Reddit blackout protests. I have a friend who said his personal best was a minute and 10 so that's my target, and my personal best is a minute and a half as of last night.
It's not 3.1 seconds like the WR but since nearly everyone I have come across in the last couple months can't solve a cube at all, I'm quite impressive to them.
I sit and solve my cube on my break at work, it's literally to stop me spending all my time on my phone. It's a newish job so now everyone thinks I'm quite intelligent, which is nice.
I know exactly one party trick based on mathematical group theory, which I have actually used to impress non-mathematicians at a party.
There's a concept called the "center" of a "group", which is the set of operations that commute with every other operation in the group. The center always contains the identity operation of doing nothing. The group of scramblings of a Rubik's cube happens to contain exactly two elements in its center: the identity, and a move called the "superflip" which takes a little bit of effort to memorize how to do, but it's not so hard. Much easier than actually solving a scrambled Rubik's cube. It's like you do a simple move repeated 4x, and then you do that whole 4x set 3x with some rotations in between. Not terribly complicated. Importantly, once you memorize it it's not difficult to do just by feel, since it's a fixed sequence of mechanical motions.
So, the party trick goes like this:
You have a Rubik's cube that is exactly a superflip away from the solved state. You hand it to an unsuspecting party guest and say "go ahead and make one or two turns" (it's important to say something like "one or two" because if they do 3 the trick becomes challenging, and if they do 4 or more it might become impossibly difficult unless you're actually good at solving Rubik's cubes, which I am not). They take this obviously unsolved cube and make a couple more moves so now it appears even more scrambled.
You take the cube back and do the superflip behind your back, without looking at the cube.
Then you move the cube out from behind your back, and at the same time (trying to be slick about it) you undo the one or two moves remaining before it is solved. Everyone gasps and say "omg he solved it behind his back" (when really you did no such thing).
This works because if S is the superflip and X is the simple moves they did to it, S X S is equal to just X because S commutes with everything. (S is also its own inverse, so that S S = 1.)
I know exactly one party trick based on mathematical group theory, which I have actually used to impress non-mathematicians at a party.
Clearly, we just need more group-based popular toys. I would definitely buy a monster group cube, and then probably get crushed by it falling over on me (how many generators does that thing need, anyway?).
Believe it or not, it's actually not that hard unless you're trying to figure it out yourself, and once you can solve a couple you can solve them all. It's mostly muscle memory, and I think it took me a week to get it down. Not a week of work time, a calendar week.
This one is more of an icebreaker/game and can be fun to do at a party where there is more talking than partying. You need pen and paper or a phone to take notes.
Ask each person to come up with a color and 3 adjectives to describe it.
Ask each person to come up with an animal and 3 adjectives to describe it.
Ask each person to come up with a body of water (can be specific like “Lake Baikal” or non-specific like “ocean”) and 3 adjectives to describe it.
Ask each person to imagine themselves in an all-white room with no doors and no windows. Write down 3 adjectives that describe how it makes them feel.
Ok, now:
The color and related adjectives is how you see yourself.
The animal and related adjectives is how you see other people.
Body of water and related adjectives is how you see your sex/love life.
Maybe not impressive but it is funny to draw 2 pounts at specific locations on a hand and then "eating" stuff by moving the "middle" thumb joint ud and down so it looks like a mouth.
Okay here's my favorite super easy card "magic" trick. Works best prefaced by "I'm not very good at it but I hope it works"
You fan a deck and tell somebody to remember the card. Then ask them to put it back on top of the deck. Make sure to remember the card on top of the deck first. Then you give the cards a very shitty shuffle, but enough so they can see their card go into the middle of the deck. If you look really awkward and unskilled, this will work even better. The card they picked and the original top card should remain together.
You then just start flipping cards off the top of the deck, 1 by 1. at some point you will flip the card that was on top of the deck, meaning the card just before it is the card in question. Keep flipping a few cards. Then (make sure you look hesitant and unconfident), say "Okay if the next card I put on the table is your card, you down your drink. If it's not, I'll down my drink" If your performance has looked shitty enough so far, they will be sure to agree, since they already saw their card be flipped.
But instead of flipping the next card, you go through the pile, find their card, and put it back down on the table.
I've done this one before and it's always worked for me. The one difference I do is after they put the card on top of the deck I give them the deck and tell them they can cut it as many times as they'd like. By cutting the deck it's incredibly unlikely they'd separate their chosen card and the top card. Plus it makes them think they have more control over things
That's risky depending on how adamant they are about cutting. If they're cutting a random spot each time, at 10 cuts there's an ~18% chance they've split the two cards up. Your odds are 50/50 at 35 cuts.
If you have apples lying around, tearing one in half with your bare hands is actually pretty easy. There are quick guides on YouTube but basically, if I'm remembering right, you put the heels of your palms together at the bottom of the apple and finger tips at the stem and kind of squeeze the apple and try open the apple like a book. It makes a big difference having freshly washed hands.
Opening a beer bottle with a lighter, a second beer bottle, your teeth (not recommended), the corner of a table (don't actually do this unless you know the table can be scratched up or chipped), or other random objects.
That's actually just a basic skill in Germany and far from impressive. Even myself who basically can do nothing with his hands can open a beer bottle with many objects that have an edge.
Not saying that it might not be impressive in other parts of the world, but dont overestimate its effect in Germany. ;)
Edit: Just remembered that I knew a guy who opened bottles with his eye socket...crazy shit.
i have two roommates who cant open it by themselves and still buying those bottles without having an opener...
In most cases i still need a lighter because i dont like beer ant those bottle caps are annoying to me
Even in this world where everything I buy or am gifted comes with another fucking bottle opener I still use the lighter or hard corner trick more than any other bottle opening methods
Knew a guy once who could do it with his bare hands, no idea how though, looked like it hurt
I will not bother using both hands to clap after. That's my party trick, clapping with each hand individually by having my relaxed fingers smack the palm.
It's the dumbest thing, and people lose all their faith in humanity when they see me do it, it's hilarious.
Ask around the table who has fast reflexes. Get a $10 bill, scrunch it a bit and put it on the table (a bit like a ball). Ask the person to position their hand some 4 inches above the bill, palm down. Then, position your hand much higher (1.5ft) also face down and bet that person that you can grab that bill before they do.
It's misleading because of the distance but if you're just normal fast by the time they react you'll already have the bill in your hands.
Contact juggling. Making empty (or full) bottles spin "weightlessly" in your hand, rolling an orange over your fingers like David Bowie... not that impressive, maybe, but a lot more impressive than it is hard to learn.
If you smoke, the smoke waterfall is neat and easy.
Take your pack of cigarettes and pull the cellophane down to create some space between the cellophane and the box. Using your lit cigarette, carefully melt two holes on the lengthwise ends of the cellophane, and then push the cigarette lit end first into one of them. If done right, the smoke coming off the cigarette will make a little waterfall and pool of smoke.
Take your lighter and a card you don't use. Slowly roll the flint thing across the card to get a bunch of flint pieces to fall/drop on the card (if you go to fast, you'll ignite the flint pieces).
Lick your cigarette on the white paper parts and roll it into the flint pieces.
Let it dry for a minute or so.
When you smoke it, it will spark here and there because of the flint stuck to the paper.