Put any type of cheap lunchmeat on the hood of their car when the sun is really beating down. If you use ham or bologna the oils sort of fuse with the paint - when they go to peel it off it takes the paint right off.

To ruin the inside of the car or any type of clothing or carpet - eat about a pound of asparagus. When you piss - do so into a bottle or a disposable squirt bottle. The urine will stink so bad from the asparagus it will pretty much ruin anything it comes in contact with. Best scenario - squirt it into the car if he leaves his windows cracked. The sun will bake it in there - knocking him off his feet when he opens the door.

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Everybody really was Kung Fu fighting....

Stick toothpicks in his locks and break them off, shove a potato all the way into the tailpipe of his car, super glue his locks shut. You could etch his windows with "etching cream" you can buy at any craft store.

It all depends on how much revenge you want. Itching powder is a great tool if used properly :]

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mail a package of poop to him (anonymous sites that do it are on the net)

all the while, sign him up for the nambla newletter.

if you know his email, sign him up for tons of porn newsletters.

order the deer piss stuff from field and stream and pour it down his heater vents

scrape his registration sticker (more annoying and a hassle)

TP his car, if its summer, use a cassette tape and hes in for a treat.

The porno sites don't keep a list available to show who signed up who. This should help
his/her blood pressure.