Depending on how far you wanna take it:
A. Cover his winshield in stickers- can't drive the car until you spend the grueling hours taking them off.
B. LAST RESORT, the ultimate destroyer, could cause serious bodily injury; get a can of Extra Strength paint remover and put a big fat line down the side of his car, from taillight to headlight!
Oh yeah, another helpful hint: if you spray shaving cream on the glass of any car window and shoot it out with a BB gun it won't make a shattering sound- think of it as a silencer for shooting out windows.