"Not long ago, the audience in a theatre was there to watch a play. Nowadays, the audience is the play, or at least the protagonist in a production that is animated by the paying customer. Recently I visited an abandoned electricity board building in Bethnal Green, east London, signing away my possessions and jacket on the door. My loafers were gaffer-taped to my socks; I was placed in a wheelchair; pushed through swing doors; and berated about the bad form of an American football team. Two seconds later, I was in a locker room, delivering a pep talk while 15 hunks glowered at me through facepaint and helmet guards."