step 1. buy chum. yes, chum. shark bait.
step 2. put it in a drywall bucket with bleach, mixy mixy, cover with saran wrap, let it sit in a nice hot sunbath for a day.
step 3. put on a mask.
step 4. find said dudes car.
step 5. proceed to pour poopy fish grossness into windshield vents @ raintray.
step 6. wait.
step 7. wait.
step 8. wait for dude to turn on the air - it's hot.
step 9. watch dude puke all over the place.
step 10. profit.
did this to a kid who smashed my cell phone in a parking lot because him and his "gangsta" friends didn't like me.
needless to say....he never bothered me again, even though he was 3x my size.