Picture the scene. You're a classical musician. Your ensemble is about to start a small concert performance when... somebody's mobile phone goes off in the audience. How do you respond?
You could shout at the person in question. You could hit them on the head with a cello. Or, if you're a member of this classical ensemble above, you could deliver a perfectly rehearsed, extremely classy response.
We won't tell you what it is - just click play on the video. And remember to turn your phone off next time you go to see your local Philharmonic.
(Via Blame It On The Voices)