The Big Bang Theory Season 5 Episode 12 : The Shiny Trinket Maneuver
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Amy and Sheldon\'s relationship hits a snag when she reveals that an article she wrote is on the front cover of a prestigious science magazine, but he simply fails to respond, causing her to leave in a huff. After being questioned by Penny, he reveals that it is because he cares nothing for biology that he didn\'t congratulate her. Sheldon tells Penny he can\'t fake smile as the fake smile he tries is for when he sees a \'koala bear\' which Am...