Zack: Hey, babe.
Penny: Hey. Did you remember to pay the rent?
Zack: Better. I used the money to buy these magic beans.

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?

Sheldon: Jacuzzi is a commercial brand, hot tub is the generic term, i.e., all Jacuzzis are hot tubs, but not all hot tubs are Jacuzzis.
Zack: Is that like all thumbs are fingers but not all fingers are thumbs?
Sheldon: Surprisingly, yes.
Zack: Nice! Now what exactly are toes?

Raj: (To Amy) If you were having Sheldon's baby, would you really want him in the room?
Penny: Yeah, if he's in the room when they're making the baby, I'll give you $10.

Amy: (Talking about "It's A Wonderful Life") It's great. It's Christmas time, and Jimmy Stewart's really depressed and he's gonna jump off a bridge and kill himself.
Stuart: Don't need to see it, living it!

Howard: I've never done this before, it's kinda fun.
Raj: Yeah, if your mom could see her little Bar Mitzvah boy, she'd have a heart attack.
Bernadette: Good idea. I'll take a picture.