Sparked by the 3rd verse to Danny Boy. Many, many songs could be improved (!) by the addition of a new verse, cleaning up the loose ends, tightening up the story, generally mucking around. For instance:

"Well, John Henry regretted his hubris,
And went over to technology
He got an MBA and went into steel,
And now he owns a steam drill factory, Lord Lord,
And now he owns a steam drill factory."

or, this classic:
"How many years can some people exist,
Before they sell out their songs?
Yes, and how many bucks can they get for their words
Hawking sneakers on TB?
Yes, and how many mutual funds can a person obtain,
Before they've got real security?
The answer, my friend, depends."

And so on....

yours, Peter T.