Kuro's Law
Any sexual discussion will ultimately end up with somebody mentioning incest at least once.
Dude 1: My sister is fucking hot.
Dude 2: I'd totally fuck her.
Dude 1: So would I.
Dude 3: Kuro's Law.
Dude 2: I'd totally fuck her.
Dude 1: So would I.
Dude 3: Kuro's Law.