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The guys are invited to Penny's Halloween party, first turning it down as they don't dance but changing their mind when costumes are mentioned. At the party, the guys have problems socializing; for example, Sheldon is unable to explain his costume as the Doppler effect, Raj cannot speak to women and Howard is mistaken for Peter Pan instead of Robin Hood. Later, Penny's ex-boyfriend Kurt (Brian Wade) shows up and confronts Leonard, causing him to leave. Penny goes to check on him and apologizes while also very upset about Kurt. Leonard tells her that she is perfect and she kisses him. Leonard asks her how much she has had to drink, she claims "a lot" and that he was smart for figuring that out. Leonard sacastically admits "yea, I'm a fricking genius" for stopping Penny's advances. She goes back to the ...


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