A co-worker's cell phone just went off. It was a Nokia and it was singing for a good long while. I'm on an open floor and people were beginning to get annoyed.
At the end, I announced in a calm, authoritative voice (like on CBC Radio 2 - Classics and Beyond) loud enough for the whole floor to hear:
Ladies and Gentlemen, that was Beethoven's "Badinerie".
=D I got a few giggles out of it, so I'm sure it relaxed a few facial muscles all around =)