Good omens - Terry Pratchett

'Armageddon only happens once, you know. They don't let you go around again until you get it right'

People have been predicting the end of the world almost from its very beginning, so it's only natural to be sceptical when a new date is set for Judgement Day. But what if, for once, the predictions are right, and the apocalypse really is due to arrive next Saturday, just after tea? You could spend the time left drowning your sorrows, giving away all your possessions in preparation for the rapture, or laughing it off as (hopefully) just another hoax.

Or you could just try to do something about it.