Sheldon has a Geology book. Why would he have that?
Added:
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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Sheldon knocks on a hallway door with Amy on "The Relationship Diremption."
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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

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 people cry at weddings?
Mary: They're practicing for what's coming later.