So in the office friday, I taped all their drawers shut, unscrewed the ball to their mice and then taped it so it wouldn't move, but when they removed the tape, the mice would fall apart. I then went to our sister company next door and did that to 18 cubicles. On fridays, everyones out at 5. Only me, two other employees and one supervisor in from 5-6:30. So then I unplugged all their phones so it resets their VM passwords. They don't lose messages, but they need to call the IT guy downstairs to reset the PW. This is great because I framed the bosses' son putting a bunch of the same notes in his desk that I left ("Happy Belated April Fool's Day"). I also put the same color tape on his desk and I saved the printout on MS Word on his computer. So today they are all upset, so when I got in I put tape on my drawer and just pretended to peel it off, so when they came by I could say it was done to me too. The only person who wasn't messed with was the bosses' son's desk and mine (although they think I got it too). I'm happy for the week now.
Oh, and on one of my only buddies there, I tied fishing line to his chair bottom running behind it so that when he pulls his chair out it lifts the top draw open. It had packets of ketchup, soy sauce, mustard, etc... that spilled out on to his desk. I had to leave the office when that happened. HAHAH! This made my week!