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When Penny invites a friend and former lover of hers, who is a "definitely not gay" guitarist, to sleep on her couch, Leonard becomes upset. They start a fierce argument, which Sheldon tries to resolve because of certain childhood memories he has about his parents arguing. He talks to Penny and Leonard to get them to apologize, but none of them is willing to admit that they were wrong. As a result, Sheldon runs away. He tries to find shelter at R...

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