Zack: It's all right. I didn't have anything going on. Plus, Penny told me we're married, and Thanksgiving is a time to be with family.

Zack: One question. How can you be sure it won't blow up?
Leonard: The laser?
Zack: The moon.

Zack: Whoa, you dated Penny?
Leonard: She didn't tell you?
Zack: She told me she dated a guy named Leonard. Who would have thought it was you?
Leonard: Who else would it be?
Zack: I don't know. Somebody bigger and- Yeah, sure. Why not you?

Leonard: Don't worry about the moon. We, we set our laser to stun.
Zack: Smart.
Leonard: Now, we'll be able to see the beam when it leaves, but it won't be strong enough when it comes back to be seen by the naked eye.
Zack: (chuckling) Naked.

Penny: Howard, cow tipping - real or not?
Howard: I'm going to say not. That's just based on me trying to roll my mom over when she's snoring.

Amy: It says here you can get an annulment if any of the following conditions were met: Were you unable to consummate the marriage?
Sheldon: Penny!? Ha! Next ...

Mike: I don't know what's scarier: the bathroom clowns or the woman that put them there?
Sheldon: All I know is you can only fit one of her in a car.
*Howard walks in*
Sheldon: And there's the clown that came out of her!