UB ed's right, it was on Freak Out. Here's the It Can't Happen Here part. There's more over at that Zappa link above. It was/is a pretty funny song. Right up there with the Montana Dental Floss Farm thing.

IT CAN'T HAPPEN HERE
(Frank Zappa)

It can't happen here
It can't happen here
I'm telling you, my dear
That it can't happen here
Because I been checkin' it out, baby
I checked it out a couple a times, hmmmmmmmm
And I'm telling you
It can't happen here
Oh darling, it's important that you believe me
(Bop bop bop bop)
That it can't happen here

Who could imagine that they would freak out somewhere in Kansas...
Kansas Kansas tototototodo
Kansas Kansas tototototodo
Kansas Kansas
Who could imagine that they would freak out in Minnesota...
Mimimimimimimi Minnesota, Minnesota, Minnesota
Who could imagine...

Who could imagine
That they would freak out in Washington, D.C.
D.C. D.C. D.C. D.C. D.C.
It can't happen here
Ba ba ba ba ba ba ba ba
It can't happen here
It can't happen here
Everybody's safe and it can't happen here
No freaks for us
It can't happen here
Everybody's clean and it can't happen here
No, no, it won't happen here
I'm telling you it can't
It won't happen here
(Bop bop didi bop didi bop bop bop)
Plastic folks, you know
It won't happen here
You're safe, mama
You're safe, baby
You just cook a TV dinner
And you make it
(Bop bop bop)
No no no no
Oh, we're gonna get a TV dinner and cook it up
Go get a TV dinner and cook it up
Cook it up
Oh, and it won't happen here
(No no no no no no no no no no no
Man you guys are really safe
Everything's cool).
Who could imagine
Who could imagine
That they would freak out in the suburbs!

Different lyrics version: https://www.youtube.com/watch?v=yEbjInR6irI

More Freak Out Lyrics page

HTML line breaks added --JoeClone, 27-Nov-01.