You're invited to the wedding of the year on The Big Bang Theory Season 9. Check out the first official promo now.
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On The Big Bang Theory Season 8 Episode 17, Sheldon shows Amy his video application to go to Mars, and it's fabulous. Here's the application.
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On The Big Bang Theory Season 8 Episode 24, Amy breaks up with Sheldon, and Sheldon has to decide what to do with the ring he had bought for her.
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On The Big Bang Theory Season 8 Episode 13, Sheldon and Leonard's moms meet for the first time, and Penny finds herself in the middle of a battle.
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On The Big Bang Theory Season 8 Episode 22, Leonard gives a graduation speech via Skype with the help of Penny, and sports cap and gown that doesn't exactly fit.
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On The Big Bang Theory Season 8 Episode 20, Penny and Leonard argue over whether or not Penny should take an audtion for a film while on a podcast with Will Wheaton.
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On The Big Bang Theory Season 8 Episode 18, the gang gathers together for one final dinner to honor Mrs. Wolowitz, eating the last food she ever prepared.
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On The Big Bang Theory Season 8 Episode 15, Sheldon and Amy have an exciting announcement to share with Leonard and Penny when they arrive home.
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On The Big Bang Theory Season 8 Episode 15, Leonard and Raj run into a man who might be Nathan Fillion, and he agrees to let them take a selfie.
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On The Big Bang Theory Season 8 Episode 12, Sheldon and Leonard agree to go shopping with Amy and Penny, but don't know how to kill the time without smartphones.
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On The Big Bang Theory Season 8 Episode 11, the guys try to get rid of a bird that gets into the clean room and threatens their experiment, but accidentally kill it.
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On The Big Bang Theory Season 8 Episode 10, Sheldon and Amy film the last episode of "Fun with Flags," sharing highlights with their viewers.
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TBBT Quotes

Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.

It's very simple. Scissors cuts paper, paper covers rock, rock crushes lizard, lizard poisons Spock, Spock smashes scissors, scissors decapitates lizard, lizard eats paper, paper disproves Spock, Spock vaporizes rock, and, as it always has, rock crushes scissors

Sheldon