It’s a location joke.

“So do you ever go out with your other girlfriend?”

“No. She’s clumsy.”

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I’d almost apologize to the good Doctor, but we’re writing our own dirty version of “Green Eggs and Ham” over here and it’s all kinds of awesome.

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Possibly related: HOLY FUCK. We are loving The Big Bang Theory. Why did it take us so long to find it and why isn’t it on Netflix?!?!?!