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.

Sheldon: Why do you have the Chinese character for "soup" tattooed on your right buttock?
Penny: It's not "soup," it's "courage."
Sheldon: No it isn't. But I suppose it does take courage to demonstrate that kind of commitment to soup.
Penny: How'd you see it? You said you wouldn't look.
Sheldon: Sorry. As I told you, the hero always peeks.