Video: Boris Johnson at Hay Festival 2012: I won't be PM Speaking at the Hay Festival, the Mayor of London was asked whether he would want to be Prime Minister. In his denial, he proceeded to give a long list of things that might happen before he could ever think of becoming the PM. "My realistic chances of becoming Prime Minister are only slightly better than my chances of being decapitated by a frisbee, blinded by a champagne cork, locked in a disused fridge or reincarnated as a olive," Mr Johnson said.