Sir Elton John is famed for his outbursts and diva-ish tantrums. So when he was invited to a presidential reception, hosted by George W Bush, the organisers must have been praying the Rocket Man would not explode. Two weeks ago Sir Elton hit out at the US president, saying he was "the worst thing that has ever happened to America". "I just wanna scream," he said. "It's a nightmare. These idiots think they can get away with anything ... it enrages me that people can just smirk their way through it." But the 57-year-old entertainer managed to keep his cool...