- Peter Venkman: You never mentioned this.
- Egon Spengler: Do you talk about the loons and the scoundrels in your family tree?
- Peter Venkman: If I didn't, I wouldn't have anybody to talk about.
- Peter Venkman: [to Slimer] You can't even get 'getting lost' straight. If you're gonna wander off, see, the idea is to go some place where we can't find you. And then we leave and then you're lost. See? Try and get it straight, next time.
- Peter Venkman: [the Ghostbusters are about to play musical instruments] Do you think it can sense I flunked music in high school?
- Ray Stantz: if it has ears...