The Universe.

I pondered the infinite universe thing before, and wondered. What if every time you've been presented with choice (not the illusion, actual choice) the universe replicated into another one where you chose a different path (1 for each path, at any possibly point in time). But that is rather human-centric (choice-centric?) and highly unlikely unless there is a God. Which seems to be rather risque in modern thought...

As for doomsday theories: Don't believe them. Humans like to be scared, humans like to believe they are the last. We would like to know how we will end. And we're (as a species) subconsciously (or even consciously) suicidal, please excuse my pessimism.