Are there any? Have a good one in good taste, or a memory even of one gone "sour?"
I used to have little wars at work with co workers. They loved me in particular for the butt of the jokes because I had an office I was never in.
My favorites were the phone riggings. I would ONLY IN RETALIATION ....
1. Pull out the jack in the handset just enough to fall out when they lifted it.
2. Tape the handset receiver "on button" down - and do this with a nice tab they can easily pull off.
3. Put tape over the mic end of the holes on the handset - same tape tab.
Lets hope it wasn't an important call or they are going to miss it.
Easy and harmless, Masking tape over the trackball or laser of the mouse - use a little piece of tape to make sure you don't get adhesive all over the trackball - that would be cruel 'cuse that is a pain to get off.
Not if someone has back issues or if you see a desk that is heavily "Ergonomically friendly" - don't mess with health and safety!!!!
C. If you can, tape or "temporally" wedge something to keep the hight adjuster of the desk chair slightly open. Some times you can just leave it all the way down - most don't check first.
D. Anyone who likes to lean way back in their chair all the time, tighten the adjuster to No movement. Never the other, that is the difference between a Lawsuit and Practical Joke.
BTW, they twisted every light in my office so I had none out of 12 or more, that took them some time and had to get foot prints off my stuff. ONE of MANY that I dare not even repeat for I don't wish some of them on anyone. But the car full of Balloons was fun.
That is enough for me.