Douglas also starred in 20,000 Leagues Under the Sea and talked about how much singing he actually did in the movie, so much so that he even bragged Frank Sinatra was jealous of him!
“I sang in that! For a guy who can’t sing, I sang a lot. [sings] ‘Got a whale of a tale to tell you lads!’… All the young kids at that time knew that song. They made a disc of it professionally, and I said in an interview that my friend Frank Sinatra was jealous of me!”