When Penny brings a cold back from Nebraska that she gives to Sheldon, she's stuck taking care of him when no one else will.
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Sheldon hires some guy to pose as his cousin, Leo, to pretend to need an intervention for Sheldon to avoid going to see Penny in Rent.
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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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Leonard attempts to talk his way out of going to see Penny in Rent after hearing her sing off key.
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Sheldon hides in stealth in the crowd during Leonard's presentation. Very incognito.
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Penny falls asleep when she, Wolowitz and Raj go to listen to Leonard give a presentation.
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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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Raj and Sheldon get into an argument when Raj is out on his blind date. Guess who she goes home with?
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Penny uses Raj and the guys as her test subjects as she practices making drinks. Here's a pic of her getting Raj liquored up.
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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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TBBT Quotes

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

It's very simple. Scissors cuts paper, paper covers rock, rock crushes lizard, lizard poisons Spock, Spock smashes scissors, scissors decapitates lizard, lizard eats paper, paper disproves Spock, Spock vaporizes rock, and, as it always has, rock crushes scissors

Sheldon