Sheldon knocks on a hallway door with Amy on "The Relationship Diremption."
Added:
Penny, Leonard and Amy toast Sheldon on "The Relationship Diremption."
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Bernadette and Howard go on a double date with Raj and Emily.
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Barry Kripke shows up to talk to the guys during lunch.
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Sheldon leads a discussion with Leonard, Raj and Howard during lunch.
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Raj has dinner with a date named Emily. Will he pick her?
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Raj has coffee with a new woman, Emily. He looks quite smitten.
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Raj goes out on a date with a new woman, Emily, played by Laura Spencer.
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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