rich-joy, I'm wondering if you can remember anything else about that quote, e.g. what it might have been in the movie which "sounds like a line from a song", or the plot or details of the movie so that we could search for the movie itself, confirm whether or not it was W.C. Fields who said it, and then try to find the quote.

I think there is not enough specific information to do a search based on that quote alone (i.e. the words are very common and there are no specific clues to narrow it down) so we might just have to wait for someone else who has heard the quote to drop into the thread and provide some more clues.