My brother and I have a song that's been going through our heads since we were kids. We think it came from a movie. It's called Tapioca(we think):

          Workin' on the railroad, twenty cents a day
          Johnnie pick a tune on your banjo      [ plunk , plunk ]
          Listen to the wheels go clackin' on their way
          Tapioca, tapioca, tapioca they seem to say

          Tapioca, tapioca, All I ever eat is tapioca.
          Tapioca, tapioca, All I ever eat is tapioca.

Can anyone tell me where this came from and if there are any more verses?