I've had a few people do that to me at work - including a manager who said he backed his Prius into my car! It happens, but it sounds like it's in good fun.
Could be worse. The one time I
didn't believe a coworker (and I usually do - am I paranoid?) was when some UAW contract fight was coming up, we were flirting with a strike happening, and one day a coworker told me the union guys were lighting off some very hot fire pits outside the gates to keep themselves warm while holding up signs and all, and doing it right by where my car was parked. I said yeah right, we're not even allowed to
smoke outside the gates, nice try. A little bit later I passed a window looking out at the gates, and guess what I saw? fire pits! By my car! I tell you, Usain Bolt couldn't have beaten me on the way out to move my car.