The gang introduces Penny to Star Wars Day on May 4th.
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Sheldon and Penny go out for dinner together on "The Anything Can Happen Recurrence."
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Sheldon talks to Leonard wearing a robe in their kitchen.
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Is Sheldon sleeping with the Geology book? Nice robe!
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Sheldon has a Geology book. Why would he have that?
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Howard shows Leonard a drawing of ... something. What is that supposed to be?
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Barry Kripke annoys Sheldon and Howard during their lunch break.
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Howard arrive for his double date with his wife, Raj and Emily.
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TBBT Quotes

Sheldon: Are you still mad about the sperm bank?
Leonard: No!
Sheldon: Do you want to hear an interesting thing about stairs?
Leonard: Not really.
Sheldon: If the height of a single step is off by as little as two millimeters most people will trip.
Leonard: I don't care—two millimeters?! That doesn't seem right.
Sheldon: No, it's true! I did a series of experiments when I was twelve; my father broke his clavicle.

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