I know a guy that did that... melted some poor pizza guys front bumper. Had it so nicely disguised. that the cops just wrote it off!

Another mean method I've heard of is taking a nozzle of a washer fluid and sprayer, rigging it up to the back of the car, putting a switch up front, and then using oil instead of washer fluid. Guy my dad went to HS with did that... Cops caught him though!