Good idea: nothing says piss-off to the snooty owners of fancy cars like running a piece of $*** car into them at random.
Pulling this off in the front yard of some senile drunken old arsehole while he's sleeping (after putting blanks in all his guns).
"I wasn't counting cards, I was cheating."
"Ugh. you give me hives."
"It's Tee-revor time!!!"