Penny: I know this is none of my business, but I just... I have to ask -- what's Sheldon's deal?
Leonard: What do you mean, "deal"?
Penny: You know, like, what's his deal? Is it girls��? Guys��? Sock puppets��?
Leonard: Honestly, we've been operating under the assumption that he has no deal.
Penny: Come on, everybody has a deal.
Howard: Not Sheldon. Over the years we've formulated a number of theories about how he might reproduce. I'm an advocate of mitosis.
Penny: I'm sorry?
Howard: I believe one day Sheldon will eat an enormous amount of Thai food and split into two Sheldons.
Leonard: On the other hand, I think Sheldon might be the larval form of his species and someday he'll spin a cocoon and emerge two months later with moth wings and an exoskeleton.
Penny: Okay, well, thanks for the nightmares.

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