Quote from Joey in The One with Monica's Thunder
Joey: Now, I can pass for 19, right? Chandler: Yes, you can pass for 19. Joey: Really? Chandler: Yes. Joey: Seriously? Chandler: Seriously? Seriously, no. Okay? You can play your own age, which is 31. Joey: [gasps] I'm 30! Rachel: Joey, you are not. You're 31. Joey: Oh, crap!