Quote from Monica in The One After Rachel and Joey Kiss
Monica: I can't believe this. Rachel and Joey? Chandler: How about the dinosaur twins in the other room? No one is manning that wall! Monica: I'm on it. Chandler: Anything? Monica: I think I hear curtains closing. Phoebe: We've got shoes being kicked off over here. Monica: Bedsprings! Unmistakable! Chandler: You do realize that's your brother. Monica: Not until you said it. Somebody switch!