one of my buddies in college used to carry a roll of pennies in his jacket pocket or he'd keep a few old spark plugs in there... and when some asshole tailed him too close, he'd spike the roll of pennies on the ground next to him or on the hood of the car and they'd have paint chips up their ass. I never condone road rage, but I've always thought it was kind of clever.
No stealing a gas cap? I think I might have to try that sometime.
