The Big Bang Theory Season 3 Episode 9 : The Vengeance Formulation
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Barry Kripke severely embarrasses Sheldon on National Public Radio's talk show Science Friday by filling Sheldon's office with helium so that his voice is higher pitched than usual. While at first pouting and announcing defeat, Leonard and Raj (originally enjoying the prank), convince Sheldon to fight back. Sheldon takes vengeance on Kripke with an elaborate trap in which a massive cloud of gooey foam, to be set off by a human presence in Kripke'...