It's Bob Newhart on The Big Bang Theory! This is a photo from "The Proton Displacement."
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Sheldon makes Leonard pays for a past mistake on The Big Bang Theory. "The Itchy Brain Simulation" is the eighth episode of the show's seventh season.
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Dr. Proton and Bill Nye the Science Guy both visit The Big Bang Theory. "The Proton Displacement" is the seventh episode of the show's seventh season.
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Sheldon feels like a fraud with his latest scientific breakthrough on The Big Bang Theory. "The Romance Resonance" is the sixth episode of the show's seventh season.
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Will Amy and Sheldon survive when they both at the university on The Big Bang Theory. "The Workplace Proximity" is the fifth episode of the show's seventh season.
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Sheldon vows revenge against Amy when she ruins his favorite movie on The BIg Bang Theory. "The Raiders Minimization" is the fourth episode of the show's seventh season.
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Will Raj's scavenger hunt bring out the best or worst in Sheldon and Penny on The Big Bang Theory? "The Scavenger Vortex" is the third episode of the show's seventh season.
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What on earth are they trying to hear on the latest The Big Bang Theory. "The Deception Verification" is the second episode of the seventh season.
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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.