Abed's Rule
Refusing to lend out DVD's and video games after having them scratched / damaged by careless friends. Inspired by NBC's Community character Abed who refused to lend out "Kickpuncher 3: The Final Kickening" for this reason.
Guy 1: Hey can i borrow MW:3 when you're finished with it?
Guy 2: Sorry dude, Abed's rule.
Guy 2: Sorry dude, Abed's rule.