S4E10: Model Misbehavior
Peter is not very discreet with private matters.
PETER: Hey, everybody! Meg just had her first period!
JOE: Peter, shut up! It's 3:00 in the morning.
CLEVELAND: What the hell's going on out there?
GLENN: Damn it! People are trying to sleep.
PETER: I'm just saying, I'm proud of her. She's a woman.
GLENN: Yes, that's very hot, and I'll deal with it in the morning...