One of the best films I've seen in a while *SPOILERS
except for the cop out ending. But, really, how do you explain the animals and everyone else disappearing? I was thinking that Sirus was from the 1800s or something, or whatever, but it was a great story and presentation. I was just waiting for the twist to explain it all.
But the end was what everyone thought all along: The Christian End of the World.
I feel cheated by the ending, but I enjoyed the ride.