Brian Logan on novelty standups
'Would you heckle an armed robber?'Have you heard that financial fraudster Bernie Madoff is playing bassoon for the London Philharmonic Orchestra? Or that Kanye West has pulled on a pair of pumps and is about to tackle Swan Lake for the Royal Ballet? Nope, I thought not. They're both ridiculous ideas. No amateur performer, however plucky, could expect to just parachute into the professional arena. Yet there's on…