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The Irish Pub Formulation (2010)
Summary
Raj's sister Priya visits and inadvertently causes trouble for the friends. She and Leonard apparently have a history, despite Leonard's pinky swear with Howard that they would not interact with her in deference to Raj. They hook up, but are discovered by Sheldon, who tries to devise an elaborate, flawless lie to cover it up. Leonard cannot persist in the deception and reveals the assignation. The guys then confess to all of the deceptions they have perpetrated on each other: Howard dropped Raj's iPhone in a urinal and told him that foreigners give Americans presents on Thanksgiving, Sheldon put ground insects into Leonard's food, and Raj used Sheldon's toothbrush. Sheldon freaks out at the last revelation, and ends his friendship with Raj, only to reestablish it again after Raj tells him that he will give him a Thomas the Tank Engine model train for Thanksgiving. The episode ends with Sheldon preparing snow cones made with mango caterpillar, which grosses Leonard out.
Recurring characters: Aarti Mann as Priya Koothrappali.
Note: Kaley Cuoco was absent from this episode due to a broken leg sustained during a real life horseback riding accident.
Title reference: The Irish pub that Sheldon included in the details of the lie to cover up Leonard's sleeping with Priya.
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Whole or part of the information contained in this card come from the Wikipedia article "List of The Big Bang Theory episodes (season 4)", licensed under CC-BY-SA full list of contributors here.