This is a scene from the 5/17/10 episode of The Big Bang Theory. Yes, that's Mayim Bialik guest-starring in the sitcom.
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Judy Greer guest starred on The Big Bang Theory as Dr. Plimpton, a famous physicist that Sheldon invites to spend the weekend at the place.
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Penny returns Sheldon to Leonard after their trip to Disney Land. The couple is sharing custody over the nerd.
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Sara Gilbert is seen here on The Big Bang Theory. She plays the character of Leslie.
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This is a photo from the episode "The Wheaton Recurrence." There's really not much to say about it, is there?
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A picture after Wil Wheaton just bowled as Sheldon prepares to counter.
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Penny and Leonard go bowling and Leoanrd sure does seem to be celebrating something.
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Wil Wheaton calls out Sheldon as the two of them meet in the bowling alley.
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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