Roman coin prank for the workplace. Try it- it's fun.

Here's another favorite I came up with.

(The results of this one are potentially even more dangerous if you misread your audience. See disclaimer in post #34.)

1. When you find a stray piece of hardware (in this case a metal or wood screw) lying around, pick it up, put it in the palm of your hand, and close your fingers.
2. Find the nearest female coworker with a sense of humor. Choose your audience carefully. (Again, see disclaimer in post #34).
3. Approach her, and hold out the hand with the screw enclosed in it. Do not open your hand yet. Say, "Hey [insert name here], ... want a screw?"
4. Wait approximately 0.05 seconds for her facial expression to change. (In my case, the resulting facial expression is usually one of revulsion rather than intrigue. Too bad. Once upon a time, that might've been different.)
5. The instant her expression changes, open your fingers to reveal the screw in your palm. Hold it out and offer it to her.
6. Laugh with her... or flee hastily, depending on the circumstances.

 

7. Do NOT screw up the delivery of the joke above, in post #44.
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There are probably not enough asses and dongs in this thread to pay for your resulting bail and/or legal expenses if you do.