Penny meets Alicia (Valerie Azlynn) while wearing an embarrassing Hillary Clinton shirt. Embarrassing because the shirt is not flattering, not for political reasons. We don't judge.
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Penny brings in Chinese for the guys and hangs out in her sweats. Don't worry, for now Wolowitz still thinks she looks ravishing. It's only when the new neighbor shows up does Penny need to step it up.
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When Raj, Wolowitz and Leonard ignore Penny in even her hot little dress in favor of the new neighbor, Penny is stuck with hanging out with Sheldon.
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Sheldon and Penny sit down and sing a sea shanty as they make Penny Blossoms (Penny's hair berets). You have to hear / see it to belive it.
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Penny and Leonard discover paint in Sheldon's spot on the couch after the gang plays paintball in next week's episode of The Big Bang Theory, "The Cushion Saturation."
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The gang eats Chinese food and Sheldon has nowhere to sit when his cushion seat is covered in paintball goo. We feel for your pain Sheldon.
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Sheldon and Penny head to the cleaners to try and get a paint stain out of his couch cushion. We highly doubt that's going to work.
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Mrs. Hofstadter (guest star Christine Baranski) meets Penny on the way up to Leonard's apartment and has no problem analyzing her and figuring out all her father issues.
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TBBT Quotes

Howard: Attention people of Earth: Tonight, there will be two moons in the sky.

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.