Zack: You want to go with em?
Penny: No.
Zack: Okay, see you later.
Penny: Wait, w-w-wait-wait-wait, youre ditching me to go look at comic books?
Zack: Are you mad at me?
Penny: Im not happy.
Zack: Milk Dud?

Zack: Hold on. The costume came with a black wig.
Penny: No. I'm not wearing it. It looks stupid.
Zack: Come on. We're trying to win a contest here.
Penny: Forget it. I'm not wearing the wig.
Zack: Honey, there is no "I" in "Justice League."

Wolowitz: Okay, the good news is, we have a Wonder Woman.
Sheldon: Oh.
Koothrappali: Yes.
Sheldon: What's the bad news?
Wolowitz: Superman probably isn't getting laid tonight.
Zack: Aw, damn.

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?

Zack: I'm Zack and I'm, uh ... could you come back to me?

Zack: How can you bounce a laser off the moon if there's no gravity?

Zack: Cool, it's gonna be in 3-D!

Leonard: Think about what this represents. The fact that we can do this is the only way of definitively proving that there are man-made objects on the moon, put there by a member of a species that only 60 years before had just invented the airplane.
Zack: What species is that?