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

Howard: Attention people of Earth: Tonight, there will be two moons in the sky.

Sheldon: Why do you have the Chinese character for "soup" tattooed on your right buttock?
Penny: It's not "soup," it's "courage."
Sheldon: No it isn't. But I suppose it does take courage to demonstrate that kind of commitment to soup.
Penny: How'd you see it? You said you wouldn't look.
Sheldon: Sorry. As I told you, the hero always peeks.