Sheldon pushes Leonard and Penny to set a date on The Big Bang Theory. "The Commitment Determination" is the 24th episode of the show's eighth season.
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Leonard and Sheldon's mothers visit on The Big Bang Theory. "The Maternal Combustion" is the 23rd episode of the show's eighth season.
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It's not a total shocker that a man with a smile like Leonard's would finally score a woman like Penny.
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The gang is pretty much all here. This is a photo from The Big Bang Theory episode "The Graduation Transmission."
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Sexy graduates have their day on The Big Bang Theory. "The Graduation Transmission" is the 22nd episode of the show's eighth season.
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The guys battle over how to construct a message for NASA on The Big Bang Theory. "The Communication Deterioration" is the 21st episode of the show's eighth season.
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Look who's back on The Big Bang Theory! Yup, Wil Wheaton makes another appearance in this scene.
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Sheldon faces a relationship crossroad with Amy when they build a blanket fort on The Big Bang Theory. "The Fortification Implementation" is the 20th episode of the show's eighth season.
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TBBT Quotes

I was expecting applause but I suppose stunned silence is equally appropriate.

Sheldon

Sheldon: Nothing more fun than a paradigm shifting evening of science.
Penny: (to Leonard) And you thought it was soaping me up in the shower.