He was in the habit of taking things for granted
Granted, there wasn't much for him to take
And the only thing constant was the constant reminder he'd never change

Tight fisted with [bad word]  it didn't seem to bother him 
that talk is even cheaper told in bulk
And the only thing constant was the constant reminder 
He'd never change

And so she yelled at him: 

You owe me an IOU - owe me an IOU
You owe me an IOU
Don't think that I'll forget
You owe me an IOU - owe me an IOU
You owe me an IOU
Don't think that I'll forget
I know what I should get this time

She was in the habit of reapplying makeup
Makeup eaten up by crocodile tears
And the only thing constant was the constant reminder she'd never change

Overtly individual - covertly traditional
She couldn't seem to make up her mind
And the only thing constant was the constant reminder she'd never change

And so he yelled at her:

And so she yelled at him: 

You owe me an IOU - owe me an IOU
You owe me an IOU
Don't think that I'll forget
You owe me an IOU - owe me an IOU
You owe me an IOU
Don't think that I'll forget
I know what I should get this time

Oh... Is it real? I don't know
But, I'll act as if it is
What's our deal? I don't know
But, I'll act as if it is what I think that it is
If it is, then this might just work

They were in the habit of taking things for granted
Granted, they never quite knew what they had
And the only thing constant was the constant reminder they'd never change

And so they yelled out loud:

You owe me an IOU - owe me an IOU
You owe me an IOU
Don't think that I'll forget
You owe me an IOU - owe me an IOU
You owe me an IOU
Don't think that I'll forget
I know what I should get
Yeah I know what I should get this time