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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TBBT Quotes

Sheldon: I recently read that during World War Two, Joseph Stalin had a research program to create supersoldiers by having women impregnated by gorillas.
Howard: What a sick use of science.
Raj: Hey, as long as the baby's healthy.
Amy: I wonder if Stalin considered any other animals.
Leonard: Hippos are the deadliest creature. A half-human, half-hippo soldier would be pretty badass.
Howard: Yes, but when they're hungry-hungry, you can stop them with marbles.
Sheldon: Yeah, the correct animal for interspecies supersolider is koala. You would wind up with an army so cute it couldn't be attacked.

Raj: Well, to paraphrase Shakespeare: It's better to have loved and lost than to stay home every night and download increasingly shameful pornography.
Penny: Oh... you poor baby.
Raj: What's wrong with me, Penny?
Penny: Nothing, nothing. You know, if we weren't friends - and you hadn't brought up that creepy pornography story - I'd be on you like the speed of light squared on matter to make energy.
Raj: Hey, you totally got that right. E = MC squared.
Penny: I listen. I have no idea what it means, but I listen.