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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 ...

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