Where is this from?
Ghostbusters. Although it’s actually four lines, one from each member of the team.
Obviously this film has been collecting dust on my DVD shelf for too long.
Edit: And now that you mention it, :smack: Of course!
Jeez, Johnny… are you okay?
Does anybody else say the “dogs and cats living together” line all the time as a joke? I think we use it about once a week.
Not as far as I know. But Bill Murray’s delivery of it was so perfect, it’s like it became an instant catch phrase.
Love that movie.
That line in the OP is directed to the mayor of New York and it leads to one of my favorite bits:
Mayor: “But what if you are wrong?”
Dr. Peter Venkman: "If I’m wrong, nothing happens! We go to jail - peacefully, quietly. We’ll enjoy it!..
But if I’m right, and we can stop this thing…
Lenny…
You will have saved the lives of millions of registered voters…"
It’s Revelations, Dan Ackroyd stylee.
Can I just say how impressed I am that you remembered the entire quote, but not the movie it came from? The best I can do is the “dogs and cats” part, and I watched Ghostbusters about seventy times in the course of one month when I was twelve.
That is my favorite segment in a movie filled with good lines! The look on the mayor’s face as he made his decision was priceless.
My wife and I do.
We do too. Though when I forget and use it with others they sometimes look at me strangely.
It was posted in GD. I’m like, ‘Dammit! Where did that come from!’ So I googled it and found a bunch of people posting it but not the source. And when you told me I remembered the scene. I’ve only seen it less than half a dozen times, even though I own it. Too many other DVDs to watch…
Sorry, I was the one who posted it in GD without the source. I thought the dogs and cats living together line was so well-known that it went without saying. 
Another huge Ghostbusters fan checking in. That whole damn movie is so quotable! One of my favorite exchanges is from Ray Stantz to Peter Venkman, which I always quote to my friends in academia:
“Personally, I like the University. They gave us money and facilities, we didn’t have to produce anything. You’ve never been out of college. You don’t know what it’s like out there. I’ve worked in the private sector. They expect results.”
Aykroyd’s delivery of that last line is spot-on perfect.
My favorite part was when they were confronting Zuul on top of the building.
“When someone asks you if you’re a god, you say YES!”
There’s also a line about crossing the beams…somebody goes into a huge scientific explanation of why they can’t do it, and Bill Murray one-lines something about, “Okay, crossing the beams…bad.”
And something about the deputy mayor having no penis.
It was the EPA guy- Walter Peck.
“Is this true?”
“Yes. This man has no penis.”
<from memory>
I forgot to tell you something… don’t cross the streams
Why
It would be bad…
I’m fuzzy on the whole good/bad thing, what do you mean bad?
Try to imagine all life as you know it stopping instantaneously and every particle in your body exploding at the speed of light
Total Protonic Reversal…
Okay, that’s bad, important safety tip, thanks Egon
I use the “There is no Dana, Only Zuul” line (in the guttural Zuul voice to boot) at work all the time, whenever the bloody phone rings, but I sub my name for Dana’s
“Russ, there’s a call for you on line 1”
<Zuul voice> There is no Russ, only Zuul!</Zuul>
“okay then, Zuul, there’s a call for you on line 1”
<guttural> There is no Zuul!</guttural>