It might be more then just our worlds.
[...his expression has harshened. Wow, this Grimsley really is different - imagine the look on his face when he sees this.]
If alternate worlds exist, then how many could there be? I'm sure that many have been made, just because of foolish actions.
[You know, Grimsley, your world has at least 2000 different versions of it.]
Or perhaps our world is the same. Hah - maybe you're from a future before I saved it.