In the 1957 movie "All at Sea" or "Barnacle Bill" starring Alec Guiness, there is a solo instrument often played to create a humorous sailor-ish effect.
You can hear a very short bit of it in this clip right at the end of the guy rowing the boat in circles. There are much longer tunes played by this instrument elsewhere in the movie, but unfortunately they weren't up on YouTube.
Does anyone know what that instrument might be? I have searched IMDB for a clue, but aside from one reference to the tune being whimsical, I didn't find anything else.
Maybe some kind of harmonica? It doesn't really sound like it...