I suppose this all depends on whther your religous or not. Some religions have rather interesting beliefs reagrding the end of the world.
Personally, I think the world will end in a very interesting fashion, namely with global, natural disasters. On a repeated and regular basis. I'm not talking '2nd Ice Age', what I mean is volcanic eruptions, tornado's, earthquakes, Tsunami's, etc. Everything that we've seen a fair amount of in the news over the last few years. This is the way the world will end, literally tearing itself apart.