I just remembered.

Me: I ask you, there's this guy who had 5 one night stands in a year. And this other guy who has 5 girlfriends in a year and he fucked them all. Is there any difference?
Poo: Uh, no?
Me: HAH I KNEW IT!
Poo: EH! NO NO NO, yes got difference!
Me: O.O Really?
Poo: The guy who had the one night stands can only fuck 5 times in a year, but the guy who has 5 girlfriends doesn't mean he has fucked only 5 times a year!
Me: ..........................................

He's the winner. Champion.