OK, well even by my standards that's pretty embarrassing.  I was walking through town today - something I hardly ever do as I usually cycle, but I'd just dropped my bike off for repair and was wending my way rather absent-mindedly back to the centre, reading a book, singing to myself without realising it and occasionally snapping at snowflakes (I like the feel of them on my tongue).  All of a sudden I heard a loud "... and ONE..." followed by gusts of laughter.  I looked up and focused, and there was the conductor of my current opera waving a cigarette at me instead of a baton and laughing like a hyaena...

Standing next to him and also grinning delightedly was his wife, to whom he introduced me.  I was mortified!!  I muttered something along the lines of, oh dear, that's bloody embarrassing... but at least you know I was practising (it had been a rhythmically tricky bit of my role that I discovered myself singing) and scuttled off post-haste.

I have a nasty feeling I made their day!