Dr. Doofenshmirtz: I know you're probably expecting some tragic
backstory to explain why I want to reverse the rotation of the Earth.
But I'm not gonna go there, ya know why? Well I'll tell ya.

Back in Gimmelschtump
I always had to keep it real
Cause when you grow up in Gimmelshtump
Young Heinz: Your childhood is less than ideal!

Dr. Doofenshmirtz:
So I don't dwell on how I'll crawled my way out of the gutter
No I don't!
When people ask me what I mean, I say
D-D-D-Do I stutter!

Dr. Doofenshmirtz: But I'm no longer a hater
Cause I got an Inator
And an over-complicated scheme
I get a couple of checks
Every month from my Ex
So I can finance my coming regime!

And though my past was a wreck
I won't let it affect
My aspirations to cause mass hysteria
Cause I'm as sure as can be
That it's my destiny
To be the ruler of the Tri-State Area!

http://phineasandferb.wikia.com/wiki/Back_in_Gimmelshtump