I love doing practical jokes.
I had a co-worker from Boston (I'm from North Carolina) and he was just real short and abrupt and came across as a prick in the office. We all had cubicles...small business setup...phone operator did mail sorting etc. I took one of those PC Magazines and put this guy's name on the mailing list for as many porn DVD/CD ads as I could find in the back of that magazine and put the company address as his address.
Couple of weeks later, they started coming in. Advertisements and provocative stuff that the front office HAD to sort to his name. They'd come back to deliver with an odd look...he in his cubicle...I'd hear "why the h**l am I getting this stuff". One day I was at the office..forgotten all about it...had a "WTH" episode with him and I lost it. Confessed.
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Another time a salesman and I moved my boss' desk in front of his main door as the salesman had a key to the other access door. Murphy's law...he has a meeting 8am next morning...can't get in door...he didn't have his other key set. Had to get someone to climb over the drop ceiling to get to the desk to pull it away enough to get in to move it. It weighed probably 300+ lbs.
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If you start doing college pranks...we'll be here all night. Koolaid in frat pool systems. Solenoids charging insulated bathroom door handles while roommate has just exited shower...water balloon launcher (had two roommates go to jail over that one)...crapping in opposing apartment pumpkins at Halloween...setting up water boobytraps on people's doors at apartment complexes. Oh man...those were the days.
Nowadays...I barely get to do the rubber band on the hand squirter thingy on the sink without wife ready to kill me.
Two days later, I dozed off at work around noon. We would normally be relieved by 1240, board the buses and go to the mess hall. After I had dozed off, Al wheeled me and my chair off in to a corner. The section was relieved and I slept on. Finally, after the bus left, one of the other guys shook me awake and told me the bus had left. I had to walk the four miles back to the barracks, in a tropical downpour. You know what they say about paybacks.