Leonard and Sheldon meet Dennis Kim, a 15 year old childhood prodigy that makes them question their intelligence, especially Sheldon.
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Being the little nut job that he is, Sheldon runs a few tests after Penny comes back from Nebraska with a cold.
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Sheldon and Leonard both sit together sick on the couch with no one to take care of them.
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Sheldon has one of his co-workers post as his non-existent cousin, Leo, in order to get out of seeing Penny in Rent.
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Sheldon tries to attack Leonard with his mind when he goes to give a presentation that Sheldon does not approve of.
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Penny practices bar tending on the boys in order to learn up for her new job that will help earn her some extra cash.
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Raj gets extremely nervous and anxious after his parents set him up for a blind date with a girl from his childhood.
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As Leonard and Raj go to get Wolowitz from his house for their Halo team they overhear his mother fighting with his new girlfriend.
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Penny joins the boys for a game of Halo and they're a little shocked that she's not bad at the game.
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A picture of Leonard and Penny kissing in costume after Penny's ex-boyfriend is a jerk to Leonard at her Halloween Party.
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Sheldon and Leonard open the door at Penny's Halloween Party dressed like quite the nerds as Penny's large friend enters the apartment.
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Leonard, Sheldon and Raj sit on the couch at Penny's Halloween Party all dresses in costume.
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TBBT Quotes

Penny: What actor holds the record for being named People magazine's Sexiest Man Alive?
Sheldon: William Shatner!
Leonard: I don't think it's Shatner.
Sheldon: Then it's got to be Patrick Stewart

Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.