Penny meets Sheldon's Drug Addicted Cousin Leopold - The Big Bang Theory

Leonard lies to Penny so that he and Sheldon can get out of watching her perform. However, Sheldon believes that the lie has too many loose ends, so he comes up with a new, unnecessarily complex one to replace it, utilizing the hidden talents of Toby Loobenfeld, a research assistant in the particle physics lab.
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S01E10 - The Loobenfeld Decay