The Celebration Experimentation Season 9, Episode 17 -  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: Adam West as Himself, Stephen Hawking as Himself, Kevin Sussman as Stuart, Christine Baranski as Beverly Hofstadter, John Ross Bowie as Barry Kripke, Sara Gilbert as Leslie Winkle, Wil Wheaton as Himself

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

Director: Mark Cendrowski

Viewers: 15.94 million Households Rating: 10.5/17 Adults 18-49 Rating: 3.8/14

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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

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.

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.

Leonard: Sheldon, we've been together so long, it's hard to remember a time you weren't in my life. And believe me, I try.
You make me laugh.
You make me a better scientist.
You make me crazy.
You're more than just my roommate, you're my brother.
Sheldon: Thank you.
Leonard: Happy birthday, buddy.

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!