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The Horror, The Horror!

"The Celebration Reverberation" is the eleventh episode of the eleventh season of the American sitcom The Big Bang Theory. The episode aired on December 14, 2017.


Sheldon and Wolowitz plan birthday celebrations for Amy and Halley, respectively. Also, Leonard a Christmas letter from his brother that causes him to spiral out about his own lack of accomplishments.[1]

Extended Plot

Sheldon making a themed birthday celebration for his girlfriend Amy (Little House on the Prairie themed) that doesn't go well (they get food poisoning). It was fun and cute.

Howard is making a birthday party for Halley and asks for Raj's help (tension between them since previous episode, but they kind of make up in the end).

Leonard and Penny had I would say a sub-plot since it did feel a little shorter than 2 other ones, but it might feel different in the aired episode. Leonard's brother sent them a Christmas card and Leonard was annoyed that his brother was (unintentionally) bragging about all his achievements this year and he tried to think up of all the cool things he and penny did this year but he could think of nothing. He was really bothered by that but Penny wasn't, she was like - "We're happy, what are you worried about?"

Thanks to report by Brilliantfool.[2]



  • Title Reference: To be entered.
  • Taping date: November 21, 2017[3]
  • This episode was watched by xx.xx million people with a rating of xx.xx (adults 18-49).
  • Total viewers including DVR users xx.x million.
  • The Big Bang Theory was ranked #x for the week ending xx December 2017.
  • This episode aired in Canada on December, 2017.


To be entered.


  • This episode will be the third time that Amy's birthday is celebrated. (Coitus or party).
  • This is the first on screen appearance of Raj's new apartment.


To be entered.



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