True.
"Dragons live forever, but no so little boys."
I've heard a dirty version of Puff the Magic Dragon. All the words are the same, but with a little timing and tone it becomes filthy.
Dragons live forever, but not so ........
little boys
Dragons wings and painted ....
rings ... make way for other .....
toys.
The real worry was that the person who sang it was a school teacher.
It was not sung in a school, though!