Just realised I did not supply a proper blicky in my first post, so will remedy that now:
http://blogs.telegraph.co.uk/news/damianthompson/100243153/pianist-maria-joao-pires-panics-as-she-realises-the-orchestra-has-st

And Grishka - I suppose the title could have been:
"Pianist Maria João Pires panics as she realises the orchestra has started a different concerto than the one she was expecting…"
or even:
"Pianist Maria João Pires panics as she realises she has prepared to play the wrong concerto…"

But they don't grab one's attention in quite the same way, do they?

As for whether or not it is simply to be expected that a soloist can switch on a dime to play a concerto she was not expecting to play, I am still impressed.

Not to mention that the look on her face when she realises the orchestra is playing a different concerto than the one she prepared is priceless - and something I think most of us can relate to - whether or not we have ever been in that exact situation ourselves...