Ray Stantz: Symmetrical book stacking. Just like the Philedelphia mass turbulence of 1947.
Peter Venkman: You're right, no ordinary human being would stack books like this.

Peter: Let's show this prehistoric bitch how we do things downtown.

Peter: Oh my God! Look at all this junk food.

Peter: He slimed me.

Winston Zeddmore: Ray, when someone asks you if you're a God, you say YES!

Peter: I don't have to take this abuse from you--I've got hundreds of people waiting to abuse me.

Peter: Egon, this reminds me of that time you drilled a hole in your head.
Egon: That would of worked if you hadn't stopped me.

Egon: There's something very important I forgot to tell you.
Peter: What?
Egon: Don't cross the streams.
Peter: Why?
Egon: It would be bad.
Peter: I'm fuzzy on the whole good/bad thing. What do you mean bad?
Egon: Try to imagine all life as you know it stopping instantaneously, and every molecule in your body exploding at the speed of light.
Ray: Total protonic reversal!
Peter: Right, that's bad. Okay, alright, important safety tip, thanks Egon.

Ray: I think we better split up.
Egon: Good idea.
Peter: Yeah, we can do more damage that way.

Ray: It can't be!
Peter: What is it?!
Ray: It can't be!
Peter: What did you do, Ray?!
Winston: Oh, shit!
Ray: It's the Stay-Puft Marshmallow Man.