Monica: Dr. Green. Oh, my God. It's Rachel's dad. Why are you here?
Dr. Green: What, the father can't stop by to see the daughter on her birthday?
Monica: No, no, the father can. But since I am the roommate, I can tell you she's not here. And I'll pass along the message. Okay? So bye-bye.
Dr. Green: Oh, you're having a party.
Monica: No, no, not a party. Just a surprise gathering of some people Rachel knows. This is Phoebe, Chandler and Joey.
Dr. Green: I'll never remember all that. So what's the deal? Rachel comes home, people pop out and yell stuff? Is that it?
Chandler: This isn't your first surprise party, is it, sir?