On July 10, 2007, Keith Jarrett began a concert in Perugia, Italy with the following speech (which can be seen here):
"I don’t speak Italian, so someone who speaks English can tell all these assholes with cameras to turn them fucking off right now. Right now. No more photographs, including that red light right there. If we see any more lights I reserve the right - and I think the privilege is yours to hear us - But I reserve the right, and Jack and Gary reserve the right to stop playing and leave the goddamn city."
Jarrett played two sets but, after seeing a small number of flashes from the audience before he had sat down at the piano, told an audience that was giving him a standing ovation that he would not be playing an encore.
In response, the Umbria Jazz Festival announced it would never invite Jarrett to perform again.Link