My Prank Ideas

Play some of the worst songs in the Apple shop speakers as loud as you can

Have a royal rumble on BMX's

Get a sign saying mining in progress, blocking a public stairway/escalator and get someone to sit/stand there and pick their nose.

Snort 50cm of random stuff

Go sledding on a satellite dish (or any other weird object)

Chain Of Slaps (One person slaps another person who slaps another and this continues in one long chain)