The Big Bang Theory Season 5 Episode 13 : The Recombination Hypothesis
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Upon arriving home, Sheldon discovers that the cutout of Mr. Spock he ordered is of Zachary Quinto, not Leonard Nimoy. As he gripes about this, Leonard notices Penny across the hall, and spontaneously asks her out on a date. Their dinner starts well, but soon goes sour when Leonard insists on over-analyzing their relationship. He comes home in a bad mood, causing Howard and Raj to assume he and Penny are on the outs. However, that night, Penny...