Never mind whistling, some old chap behind me in Skipton Morrisons this evening suddenly did one of those "dee dah-do-de-dah" out of the blue excerps from (probably) a second world war Vera Lynn classic. Then he went silent for 3 or 4 minutes before doing exactly the same 5 note rendition over again.
Do you know, I'm pretty sure he wouldn't have known he was even doo-dar ing out loud![]()