An easy and harmless prank I did once was to zip tie the levers on the office chairs. So when a person sits down, the chair goes down. Then they stand up and the chair goes up.
My old boss used to live a block away from me, so before I went to bed I tied tin cans to his bumper. He started work a half hour before me, so I found those tin cans on my driveway when I went to work... but it freaked him out first.
Another year we talked for weeks about what we were going to do to each other around the office. I did nothing. People were on edge all day waiting to happen upon my prank that never came.
Once, I changed the default new mail sound on a person's computer to play a song by The Wiggles. The poor guy couldn't figure out why he was randomly hearing a children's song playing on his PC. It took him most of the day to correlate the song to new email.
Tape across the bottom of optical/laser mice. I did this more than one time throughout the year. My old boss kept throwing away the mice and ordering cheap replacements, so I decided not to tell him what really was happening. Too bad he was an IT guy.
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