The cliché runs that most stand up comedians would kill to be rock stars and a lot of rock stars would fancy a go at comedy. There have been a few comics who have successfully straddled the humour/music divide - Tim Minchin and the great Bill Bailey being two standout examples - but, alas, rock stars' ambitions to conquer the world of drollery has not had as much success, although Bono's comic persona has endured for over three decades - albeit unintentionally.