The Big Bang Theory Season 1 Episode 15, The three boys argue over who has standing to pursue Missy. Leonard gets sneaky and tells Sheldon he has to protect Missy's genetic integrity by only allowing someone suitable to fertilize Missy's eggs in order to potentially produce an individual as remarkable as Sheldon himself. Sheldon apparently finds merit to this argument, as he storms out of the bedroom proclaiming that whoever wants to get at Missy's fallopian tubes will have to go through him!
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