Embarrassed after being defeated by a Bar Mitzvah party at paintball, the guys are surprised when Penny invites them to her upcoming Halloween & Costume party. They decide to go, but for them, the party is a disaster. Sheldon, who is sad that there is not going to be a costume parade and awards, tries to make people guess what he has dressed up like, while Howard tries to impress different women at the party but with no success. Leonard gets in a disturbing situation when Pennyâ€™s ex-boyfriend Kurt shows up at the party and insults him, and Koothrappali tries not to talk to any women because of his mythology, but a situation pops up that result in him and a girl in bed together.
Aired: 29 Oct 2007