Barry Kripke: Hello, I hope I'm not too early.
Bernadette: No, no, no. Come on in.
Barry Kripke: And how is the radiant mommy-to-be?
Bernadette: Doing great.
Stuart: You're pregnant?
Bernadette: Yeah.
Stuart: Sounds like something a member of the group might know.
Penny: Yeah, birthday party first. Pity party later.

Sheldon: I know that you worked hard to put this together. I'm sorry I'm ruining it.
Penny: Oh, pl- you're not ruining it. Look, at some point, Raj will try to get everyone to do the Electric Slide. Now, that will ruin it.

Adam West: Happy birthday, young man. And if any of you have enjoyed seeing me here today, I'm also available for Comic-Cons, bachelor parties, bar mitzvahs...

Amy: Okay, so how do you feel about party balloons?
Sheldon: Uh, Mylar balloons, yes. Latex balloons, no. Water balloons, I will jump off the roof and aim for your car.

Amy: Have to say, you you do look good in that suit.
Sheldon: Oh, thank you.
Amy: Maybe later I'll, uh, get to see you in your birthday suit.
Sheldon: But this is my birthday suit. Are you having a stroke? Because that's the kind of thing that just ruins a birthday party.

Howard: Sheldon, I don't think everyone-
Sheldon: Wolowitz, perfect. Everyone listen to Wolowitz.
Howard: Okay, then, uh, Sheldon, we've known each other a long time. And it is a pleasure to work with you and call you my friend.
Sheldon: Little generic. Keep thinking. We'll circle back.

Sheldon: Thank you. That was wonderful.
Penny: Oh, wait, wait, wait. Stuart didn't get to speak.
Stuart: Oh, oh, okay. Um. Uh, Sheldon, I've spent most of my life feeling invisible, but having you and everyone-
Amy: Hey, everybody, listen up.
Penny: (To Stuart) You nailed it.

Raj: Thank you! That's why I say Keaton's number one. He brought a sense of humor to the role.
Adam West: Oh, if you're gonna factor in a sense of humor, then I should be at the top of the list. It should be me, Keaton, Kilmer, Lego, Bale, and that pretty boy Clooney.

Howard: Can we just all agree we're worried about Affleck?
Raj: Sure.
Leonard: Yeah, of course.
Adam West: What's an Affleck?

Sheldon: Uh, um uh, thank you all so much for coming. Uh, Beverly. Wil Wheaton. Adam West, for some reason.
Leonard: Batman finally came to your party.
Adam West: Happy birthday, Sherman.

(After Sheldon runs out of his party)
Adam West: I still get paid, don't I?

Leonard: Ready when you are, Professor Hawking.
Stephen Hawking: And a one, and a two.
All: Happy birthday to you. Happy birthday to you. Happy birthday, dear Sheldon. Happy birthday to you. (to you.)

Amy: But it's the one day a year that's just all about you.
Leonard: One day. (Laughs) Right.

Amy: You realize none of those things would happen now?
Sheldon: I do, but why do you care if I celebrate my birthday at all?
Amy: Well, you made my last birthday so memorable, I wanted to return the favor.

Penny: You know, if you had a party now, you have plenty of friends that would love to come.
Leonard: And we live here, so we have no choice.
Penny: Yeah.