Zombie Apocalypse
There are many people who believe that the earth will end from the zombie apocalypse, possibly when the Mayan calendar ends. If the world does end right then lets just hope our demise is quick and swift, not painful like zombies.
Just to reassure people I think we are quite safe from the world ending, as there have been many false prophets bearing false witness. An example is Y2K when everybody thought computers would malfunction and think that it is 1900 all over.