Cruel (yet hilarious) practical jokes I have played on coworkers

1. Setting up a plastic barnyard throughout a friend's lab. This was returned to me in the form of one hidden plastic animal at a time.

2. Letting the aforementioned friend return from a vacation to find every water-filled object in his lab filled with several of those plastic creatures that grow when they get wet.

3. Wrapping a coworker's desk in bubble wrap, complete with a crash pillow, following her 4,000th stupid accident.

4. In a lab full of left handed people, a not-too-bright young girl says "It's not my fault you're a left handed freak." She left the room and we took everything on her lab bench and reset it as the perfect mirror-image of itself.

5. Wrapping aforementioned not-too-bright young girl's bench in plastic wrap.

6. A $1 rubber rat named Taco has been hidden in more places than you can imagine.

7. Hiding plastic cowboys and indians throughout a co-workers' bench/belongings so that he was finding them for over a week. At least three went home with him.