(Great, now that whistling tune is stuck in my head for the rest of the day!)
Ok, it bugged me this much: (had to look it up)
Whistling tune from Bridge over the River Kwai
http://www.jahozafat.com/php/sounds/?id=bst&media=MP3S&type=Movies&movie=Bridge_On_The_River_Kwai"e=rkwhist.txt&file=rkwhist.mp3
Good one. Only I wish you hadn't given the link for the song. It will play in my head till I go to bed!!