There was a similar song from the musical Scrooge!, a Broadway adaptation of A Christmas Carol. When the Ghost of Christmas Yet to Come takes him forward, Scrooge hears his former chamberservants singing:

"Thank you very much, Mr. Scrooge!
That's the nicest thing that anyone's ever done for me..."

Poor Scrooge then finds out they're singing about his death, and their ill-gotten gains from robbing his bed-chamber, etc.

'Fraid I don't have the lyrics to the song - maybe a search for the musical's cast album or something will help you find it.