Who hasn't been there!

[Mags]

http://uberhumor.com/wp-content/uploads/2014/07/JiAzPyb.gif

Never done it, but the thought has been there many times.

[Thorin]

I've never really thought about damaging other people's vehicles, but I've certainly thought about parking one inch away from people who are parked across multiple spots, so they can't get out until I leave.

[Lazybones]

There are nasty bumper stickers you can purchase as well but you would get fined for damage in any case..

[Mr. Analog]

Hah!