Take a squirt gun into the rest room stall next to someone and shoot little drops over the wall every couple of seconds while pretending to pee.
774
0
Put tape over the optical sensor of someone's mouse.
867
1
Install the Blue Screen of Death screen-saver on someone's computer.
833
3
Write a message on an upside-down paper cup that alludes to something horrible being trapped under it.
Leave it on a coworker's desk or in a conference room.
1484
1
Paint a bar of soap completely with clear nail polish so it won't suds up.
