Damn, I'm late to the party. I can quote the ENTIRE movie from memory. EVERY line. Because I once watched it with electrodes hooked to my ears and got an electric shock any time I missed a line.
"I'm studying the effect of negative reinforcement on ESP ability."
"The effect?! I'll tell you what the effect is!"
Okay, here's the capper - entirely from memory:
"You seem to regard science as some kind of dodge, or hustle. Your theories are the worst kind of popular trip, your methods are sloppy, and your conclusions are highly questionable. You are a POOR scientist, Dr. Venkman."
"I see."
"And you have no place in this department, or in this university."
And the one my friends and I use EVERY day, a dozen times each:
"Yes, have some!"