Leonard and Sheldon don't want to hear Penny sing on the musical version of Rent, so they lie and say they have to go to a science convention. Sheldon believes that penny may uncover the lie, so he tells her that Leonard was lying and lies, saying that they're actually going to his (pretend) cousin Leo's drug intervention. Sheldon doesn't want to get found out, so he puts a facebook page for Leo and pays a guy to pose as Leo. Leonard then has to watch the video of Penny singing in the musical with her seeing his reaction. What hilarity.
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