Some of you must be real fun to work with.
A couple years ago I was in Rite-Aid waiting to check out and bought $0.49 realistic rubber snake out of a clearance bin.
A coworker of mine keeps flip flops under her desk so she can kick off her heels. I put the snake in a flip flop.
The BEST part is that she didn't suspect me, and put it in my desk drawer. Snake recovered.
I think I used it on a couple other people, then loaned it to my GF and she used it on a bunch of people at her Vet Clinic, namely putting it in other vet's lockers.
When she was done, I gave it to my dad, and it made the rounds at his work.
The per prank cost of the snake worked out to about 5 cents.
Everytime the snake was used it was by someone in upper management wherever they worked. Everyone had fun.
Right now, I'm screwing with a friend at work with a set of harbor freight car jack dolly's. I'm moving his car slightly every couple of days.