Judgement day (again)
Never mind 2012, everything kicks-off on May 21st (and finishes Oct 21st)
It's got mathematics behind it, but this is what happened last time: despite the fact that he was wrong in his previous prediction of the end of the world. In his book 1994? he claimed there was a very high likelihood that the world would end in September 1994, although he did acknowledge in the book "the possibility does exist that I could be wrong"
(I'll be in the pub)