917 - The Celebration Experimentation Aired February 25, 2016

The Celebration Experimentation

After more than nine years together, the gang finally celebrates Sheldon's birthday, surprising him with a special guest, on the 200th episode of The Big Bang Theory.

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Guest Stars: Kevin Sussman as Stuart, Christine Baranski as Beverly Hofstadter, John Ross Bowie as Barry Kripke, Sara Gilbert as Leslie Winkle, Wil Wheaton as Himself, Adam West as Himself

Writers: Chuck Lorre (Story), Eric Kaplan (Story), Jeremy Howe (Story), Steven Molaro (Teleplay), Steve Holland (Teleplay), Tara Hernandez (Teleplay)

Director: Mark Cendrowski

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Episode Notes

  • The title refers to Sheldon's decision to allow his friends to celebrate his birthday with a party.
  • This was the 200th episode of The Big Bang Theory.

Episode Quotes

Leslie Winkle: Uh, in the past, I would've said something obnoxious, like, "Happy birthday, dumbass". But I'm not gonna do it. You and I have both grown a lot, and it's just so nice to see you all again. So happy birthday, Sheldon.
Sheldon: Oh. Oh, now, you know I hate change. Say it.
Leslie Winkle: Happy birthday, dumbass!

Barry Kripke: Someone call Animal Control. There's a cougar on the loose.
Beverly Hofstadter: Barry, stop.
Leonard: Seriously, Barry, stop.

Amy: We've got someone who couldn't be here but really wanted to wish you a happy birthday.
Stephen Hawking: Hello, Sheldon.
Sheldon: (gasps) Professor Hawking.
Stephen Hawking: Happy birthday to you.
Sheldon: Thank you so much. I can't believe you're-
Stephen Hawking: Happy birthday to you.
Sheldon: Oh, you're singing. Well, I'm sorry.
Stephen Hawking: Happy birthday, dear Sheldon.
Leonard: Uh, Professor Hawking, if you just give us one second, we'll light the candles, and we can all sing together.
Stephen Hawking: I was crushing it, but all right.

Raj: You know, Adam West is my favorite Batman? Well, after Michael Keaton, Christian Bale and Batman from The Lego Movie.
Howard: Don't say that to him.
Raj: What? He beat out George Clooney. And that's something. Like, I love me some Clooney.
Leonard: Don't say that to anyone.

Penny: So what's going on?
Sheldon: I don't know. I looked around the room, and I saw all the faces and the presents, and it it was just too much.
Penny: I get that. Hey, you want to just bring a few people in here? You know, Wil Wheaton in the bathtub, Batman on the toilet. It'll be like the weirdest Comic-Con ever.