My inability to whistle in tune creates a number of interesting variants and might be taken as evidence that the folk process is still alive

I realise that was tongue-in-cheek, Spleen, but if someone overheard you, thought "That's a catchy little tune" and whistled it themselves later, that would, to my mind, be a perfect example of the folk process in action today - and not a folk club or archivist in sight!