About 30 years ago, two secretaries in another building at work decided to play a prank on me. They called my office in a panic, saying that one of them had her hair stuck in a tractor-feed printer. I grabbed the scissors from my desk, and ran across the grounds to their building to cut her free.
When I got there, both secretaries were standing up and the printer was running normally. A few seconds later, one of them faked a paper cutter accident with a ketchup packet, screaming that she had just cut her finger off! They knew that I have the world's weakest stomach, but didn't know that I owned one of the first pocket cell phones. I ran outside and called for an ambulance on my cell phone! Long story short, I was on the receiving end of a stern lecture about calling in false reports when the police and ambulance arrived, and they received an even-more-stern lecture for playing pranks that cause someone to call emergency services.
Well, you know that a prank like this cannot go un-returned.
Our department saved every single styrofoam packing peanut that we received in equipment shipments for months, amassing five huge lawn and leaf garbage bags full of them. One of those secretaries parked her Ford Escort hatchback with the sunroof open outside their office building every day. Somehow,
those five huge bags of statically-charged packing peanuts wound up dumped in her car. Whoever did it
also stuck a note under a wiper blade that said "You drive me nuts, now drive your own!"
If you've ever seen static-charged packing peanuts in the loose, you can take it to the bank that her car went to the junkyard with concealed packing peanuts in it even after she spent hours picking them all out.
From that day forward, I have been 100% anti-prank at work, going as far as stopping pranks when I see co-workers plotting them. They think that I'm a party-pooper, because none of them were around back in the day to see the reason.....