Sheldon's upset with Howard at a takeout dinner in the apartment.
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Raj asks Amy for help writing a letter to a woman.
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Sheldon's upset that Leonard bought a dining room table for the apartment.
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Bernadette's not sure whether to encourage Howard's return to space or not.
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Sheldon goes over to Amy's house on "The Table Polarization."
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Howard is offered the opportunity to go back into space on "The Table Polarization."
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Leonard buys a dining room table for the apartment.
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What is this stick? Both Howard and Raj look ecstatic about it on "The Table Polarization."
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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.

Sheldon: If you could wake up tomorrow having gained any one quality or ability, what would it be?
Penny: Well, not to steal from the Bible, but turning water into wine sounds pretty good.