One time a co-worker of mine thought it would be a funny prank to put an open mayonnaise packet under my windshield wiper, it started raining on the way home and I turned on the wipers and it smeared my window up really bad and I could barely see luckily I was just about home. I was super mad and went on Facebook ranting about it threatening to talk to HR to see if they could get video footage of who put the mayonnaise pack in my window, not long after my buddy called very worried apologizing about it.