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.