Depending on circumstance, a couple of Mike Cross songs come to mind:

"Bill's Funeral"

"If heaven is glad, when sinners cease to sin,
If the devil is glad when another soul comes in,
If the earth is glad, to be rid of a knave
Then everybody's happy, 'cause Bill is in his grave."

or "Best Friend"

"The best friend I ever had has run off with my wife
And left me here alone to face the trouble of my life
....

He didn't have to sneak her off, I would 'a helped 'em pack
But he'll still be my best friend long as he don't bring her back.
...
In time he'll come to realize the nature of his luck
And then he'll learn to love her like a 'possum loves a truck."

etc.

John