Whats the stupidest thing someone stole off your car ?

Here's one for us A-body folks.
Last summer, a couple of buddies were going to the Pure Stock drags.
One goes and picks up his Duster and leaves it at the other's house, on a flat trailer, in the back of the driveway, and puts a cover on it. Next day his "Plymouth" front license plate is gone... One of those novelty tags...
We figured it was a joke and would show up. Nope.

Another time, I come home from work and notice a nice early VW GTi without a gas cap my next door neighbor's friend just got, I even mentioned "nice ride" to the guy...
Next morning my wife's GTi is missing the gas cap.
Don't see the other GTi for days, and had bought another cap when Asshole shows up, with cap on his car. Confront him face to face, and he say no, wasn't me. I tell him there was a very particular rust spot inside cap, and walk over and take his off. Guess what? Her cap.
I told him in no uncertain terms I'd be happy to take one of his fingers if he ever f#cked with it again...