We had a guy in the factory go and get a supervisor's hardhat from the super's office. He then took a healthy dump in said hardhat, and put it back in the closet from where it came.
I witnessed the supervisor at 7:00 AM carry the hardhat into a bathroom and drop it into a garbage can. It took a couple weeks for word to get around as to why he tossed his hardhat.
After retirement, a shift electritrian finally claimed credit for the dastardley deed.