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The Big Bang Theory

Season 4 Episode 6:

The Irish Pub Formulation

Leonard tries to keep everyone from finding out that he spent the night with Raj's sister, but Sheldon finds out and concocts an elaborate story to help him keep the secret from Raj.
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About The Big Bang Theory:

A woman who moves into an apartment across the hall from two brilliant but socially awkward physicists shows them how little they know about life outside of the laboratory.