Jim Parsons owned this episode once again, Penny and Leonard have a huge fight when he learns that Penny is going to be having an ex boyfriend over to stay for a couple of days. Sheldon doesn't like it one bit, so he acts on one occasion his parents' fights in attempt to show Leonard and Penny how they shouldn't be acting. Sheldon tries stop them fighting by first visiting Penny at work and asking her to apologize and telling the same thing to Leonard. It took Sheldon hiding out in the comic book store to get them to stop fighting.
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