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What are good office pranks to pull if everyone else is really serious about work?

Public Comments

1. I did this once: http://www.youtube.com/watch?v=KQ9yuDf1k0Q Hilarious.
2. this is a good one, but it takes some time, so i would suggest running some other pranks at the same time, to keep you busy (and amused) while this one matures. put a coin into the handset of a co-worker's phone. wait a week, and add another one. the small increases ans relatively long time between them will mean that the victim will get used to the new weight of their handset without even noticing the change. when the handset is full of coins, wait for two weeks, and then remove all the coins. when the victim comes in the next day call them, and watch them hit themselves in the face with their phone. fun to watch, and the best part about it is that no-one will know, so, for the serious co-workers who don't tke things well, this prank is perfect. you can own up if you like, but if the person starts breaking things and demanding punishment for whoever did it, you can act innocent.. :)
3. I liked this zip tie prank idea of zip tieing multiple things together.