the radical idea

 RAY
Funny, us going out like this. Killed by a hundred-foot
marshmallow man.

PETER
We've been going about this all wrong! This Mr. Stay-Puft
isn't so bad. He's a sailor, he's in New York; we get this
guy laid, we won't have any trouble!

marshmallow man continues scaling up the side of building

EGON
I have a radical idea. The door swings both ways. We could
reverse the particle flow through the gate.

PETER
How?

EGON
We'll cross the streams.

PETER
Excuse me, Egon, you said crossing the streams was bad.

RAY
Cross the streams...