Let's hear some fun ideas for confusing connector sleeves!

A power plug, but the three-prong ones like we have in the UK. The two lower prongs would appear to be plugged into the phone, and the top prong would just hover uselessly above the phone.

Bonus points for following the shape of the plug properly and having the cable come out of the bottom of the wall wart, so the phone can never lat down flat while it's charging.