No whistling for me (except to annoy my whistling-challenged sister, of course), but I hum a lot. When I'm at home I'm almost always listening to music of some kind, and usually singing along, but when I'm running errands and out in public and stuff, I hum (very softly, as people unfortunately stare at you in distaste when you belt out Cole Porter songs in the grocery store). Sometimes if there's nobody around I scat randomly, Ella Fitgerald-like (I'm very good at this, by the way). I think all this is because I'm extremely suceptible to Song Stuck In Head-Idis.

Qua "Once heard a woman singing 'Ding Dong The Witch Is Dead' in the women's bathroom at Wal-Mart" rtz