One thing I always wanted to do and tried to do last year was get a hold of some crab medicine, hopefully one called something like "crab begone." I wanted to pour half of it out and put the opened bottle with cap off on the metal bar in the male bathroom crapper at work. I wanted to make it look like someone sat down and splashed their privates and forgot to clean up after.
This would be funny cause we got only 2 male crappers and people would be scared to use them. Everyone would be accusing other people and looking for the tiniest scratch.
I couldn't find any crab medicine over the counter to do this with.