Quotes from the iconic movie:
Dr. Peter Venkman: What I'd really like to do is talk to Dana. Dana? It's Peter.
Dana Barrett: There is no Dana, there is only Zuul.
Dr. Peter Venkman: Oh, Zuulie, you nut, now c'mon. Just relax, c'mon. I want to talk to Dana. Dana, Dana. Can I talk to Dana?
Dana Barrett: [in an inhuman demonic voice] There is no Dana, only Zuul!
Dr. Peter Venkman: What a lovely singing voice you must have.
Dr. Peter Venkman: This city is headed for a disaster of biblical proportions.
Mayor: What do you mean, 'biblical?'
Dr Ray Stantz: What he means is Old Testament, Mr. Mayor, real wrath of God type stuff.
Dr. Peter Venkman: Exactly.
Dr Ray Stantz: Fire and brimstone coming down from the skies! Rivers and seas boiling!
Dr. Egon Spengler: Forty years of darkness! Earthquakes, volcanoes...
Winston Zeddemore: The dead rising from the grave!
Dr. Peter Venkman: Human sacrifice, dogs and cats living together... mass hysteria!
Mayor: All right, all right! I get the point!
[clearing away tables in the dining room to make room for the ghost trap]
Dr Ray Stantz: I've gotta get this in the clear...!
Dr. Peter Venkman: Wait, wait, wait! I've always wanted to do this...
[He yanks a tablecloth off of a table, overturning and shattering everything except the centerpiece in the middle]
Dr. Peter Venkman: [triumphantly] And the flowers are still standing!