2. Season 1, episode 1, Part 2

Sheldon: Leonard, I don't think I can do this.

Leonard: What, are you kidding?

You're a semi-pro. Sheldon: No.

We are committing genetic fraud. There's no guarantee that our sperm is going to generate high IQ offspring, think about that. I have a sister with the same basic DNA mix who hostesses at Fuddruckers. Leonard: Sheldon, this was your idea.

A little extra money to get fractional T1 bandwidth in the apartment. Sheldon: I know, and I do yearn for faster downloads, but there's some poor woman is going to pin her hopes on my sperm, what if she winds up with a toddler who doesn't know if he should use an integral or a differential to solve the area under a curve.

Leonard: I'm sure she'll still love him.

Sheldon: I wouldn't.

Leonard: Well, what do you want to do?

Sheldon: I want to leave.

Leonard: Okay.

Sheldon: What's the protocol for leaving?

Leonard: I don't know, I've never reneged on a proffer of sperm before.

Sheldon: Let's try just walking out.

Leonard: Okay.