If cats could sing, they'd hate it too - The Big Bang Theory

Sheldon and Leonard hear terrible singing from the upper floors. They soon discover it was Penny, who announces that she has landed the role of Mimi in the musical show Rent. Leonard lies to Penny that they will be attending a Symposium on Molecular Positronium to avoid attending Penny's show and hurting her feelings.
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S01E10 - The Loobenfeld Decay