When Roger Waters played Glastonbury in 2002 he did some of the old Pink Floyd stuff in quadrophonic live. There was one with a load of dogs barking, which confused the heck out of a real dog that had somehow got into the audience at the Pyramid Stage -- silly dog, confused by the quadrophonic, we thought -- and then another one with a helicopter crossing the soundstage that had everyone, not just the dogs, looking up to see it, but it wasn't there...

Peter