Leonard the Cellist
Leonard join Leslie's string quartet at the cellist. However, we all know the real reason Leslie invited Leonard to join.

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The Big Bang Theory
The Big Bang Theory Season 1 Episode 5: "The Hamburger Postulate"
Leonard Hofstadter
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The Big Bang Theory Season 1 Episode 5 Quotes

Sheldon: Can't we just go to Big Boy? They only have one burger: the Big Boy.
Penny: The Barbecue Burger is like the Big Boy.
Sheldon: Excuse me, in a world that already includes a Big Boy, why would I settle for something that's like a Big Boy?

Sheldon: I need your help in a matter of semiotics.
Penny: What?
Sheldon: Semiotics, the study of signs and symbols as a branch of the philosophy related to linguistics.
Penny: Okay, honey, I know you think you are explaining yourself, but you're really not