What are some strange SFW objects that can fit in the handle of a car door?
My one friend and I have been leaving odd gifts on my friend's car with notes like "I think this fell out of your car" nothing of value. Nothing that can damage the vehicle.
A balloon filled with helium tied to the handle. (How did that "fall out"?)
A gallium coin (if it's cold outside then it'll stay solid and then melt when they put it in their pocket).
An opened (but unused) bandaid. The biggest one you can find. Stick it to the handle so it flaps around and they have to choose between touching the gauze (it's clean, but they don't know that) or the sticky part to pull it off.
A household smoke detector. Use a piece of string to tie it to the handle.
Baby shoes. Again, tie them to the handle.
7 worms in a bag. They're lucky.
Whenever you go into a gas station, buy a random keychain and put that on there. Watch your friend start drowning in keychains.
Christmas lights. Just all of them. All the Christmas lights all over the car. But make sure to thread them through the driver-side handle and include your "I think you dropped this" note.
That's true, but if the car is cheap plastic, then it might be fine.
(For those not familiar with gallium, it's basically mercury but safe; so it's a liquid at room temperature but a solid just below that, depending on where you live, without the risk of Mad Hatter's disease)
They do make little 1-serving packets of PB, kind of like the ones for BBQ sauce or honey mustard. Sometimes you can find them at hotel continental breakfasts.
A very tacky car freshener. Some are dirt cheap, the cardboard ones I'm talking about. Pick a design that is silly or ugly for them... Or maybe a fragrance that you know they're not a fan of
Roll up a 'trump 2024' poster.
Pikachu keychain.
Pom Poms' from the dollar store.
Tie a pool noodle to the driver side doors (with a bow knot that can be undone easily).
A really long striped stocking, hot pink or some neon color.