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.

 808

0  

Remove the shower head and place a chicken bouillon cube in it, then put the head back on.

 719

1  

Put a "Please Use Other Door" sign on the entrance to your office building if it only has one entrance.

 1542

1  

Put tape over the optical sensor of someone's mouse.

 904

1  

Hide an alarm clock in someone's bedroom and set it for 3:00 a.m.

 835

0