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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Amy and Bernadette make a Death Star Cake to celebrate Star Wars Day.
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Sheldon, Howard and Raj start celebrating Star Wars Day on May 4th.
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Hooray! Amy and Sheldon share a kiss on The Big Bang Theory.
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Emily and Raj share a romantic moment on The Big Bang Theory.
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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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Leonard goes out with just Penny on a dinner date that Penny originally thought was going to be a group dinner.
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There is only one Raj.
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TBBT Quotes

Sheldon: Are you still mad about the sperm bank?
Leonard: No!
Sheldon: Do you want to hear an interesting thing about stairs?
Leonard: Not really.
Sheldon: If the height of a single step is off by as little as two millimeters most people will trip.
Leonard: I don't care—two millimeters?! That doesn't seem right.
Sheldon: No, it's true! I did a series of experiments when I was twelve; my father broke his clavicle.

Penny, there's only one cookie with something in the middle that solves life's problems, and that's an Oreo. Or a Nutter Butter, if you're in a pinch.

Sheldon