I've had it happen too... I've come out of a restaurant to find someone sitting in the drivers seat (shifting gears) and another time 2 guys with the hood open.

When I asked what the "Eff" they were doing they told me they wanted to see if it was an original 427.

I have a scratch on the top of one of my fenders where I assume someone was sitting on my car

If it wasn't illegal to kill stupid people. . . .