After some security concerns after a break in, Sheldon finds himself sneaking out on his ledge.
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Penny and Leonard come outside to see Sheldon trapped by a net from the security system they installed.
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We never thought we'd see the day when Sheldon and Raj go to a University mixer together and meet some ladies, Martha (Jen Drohan) and Abby (Danica McKellar).
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That's right, Sheldon meets a girl, Martha (Jen Drohan) at a university mixer and ends up with her back at his place... with his hulk hands on.
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Sheldon defines the word cool when he puts on his toy hulk hands and in front of Raj.
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After meeting two girls at the university mixer, Raj and Sheldon invite them for a raging game of Rock Band at the apartment.
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Sheldon helps decorate the tree and wants to add the bust of Sir Isaac Newton, which he argues is more Christmasy than Jesus.
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Penny comes to Sheldon for help to better understand Leonard's work and here he is training her.
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Raj and Sheldon race... with a little Mario Kart on the Wii.
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When Sheldon is embarrassed by Kripke on National Public Radio, Sheldon comes to comfort his friend.
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We love any scene involving Sheldon and Penny together and here he is taking her to the hospital when she's injured.
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With Leonard gone, Sheldon helps an injured Penny. She looks a little loopy here.
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TBBT Quotes

Penny: Here's a question-- as an alien pretending to be human, are you planning to engage in any post-prom mating rituals with Amy?
Sheldon: There are post-prom mating rituals?
Penny: Not always. Unless your date drives a van with an air mattress, then always.
Sheldon: Well, if it's part of the prom experience, then I'm open to it.
Penny: You're kidding.
Sheldon: I may be an alien, but I have urges.If Amy wants to copulate by firing her eggs into space, well, then, I will happily catch them with the reproductive sac on my upper flermin. I'm not the best at reading facial cues, but I can see that you're a little turned on.

Penny, there's only one cookie with something in the middle that solves life's problems, and that's an Oreo. Or a Nutter Butter, if you're in a pinch.

Sheldon