A few minutes ago on IRC, I told everyone that Pinkie Pie (not Diego) seems to believe that the earth is flat. I meant it as a joke, but here's the thing... It could have been Pinkie Pie. She could be living somewhere with Rainbow Dash, Applejack, Twilight Sparkle, and all the other ponies. In real life.
Inb4 you say, "Olol they dont exist nub", here's the reason I believe this. You can't prove that something doesn't exist. You can only prove that something does exist.
For example, you could say that there isn't a giant pink monster in the Siberian pine forests called Neddy, but just because you said it, that doesn't mean there isn't a giant pink monster called Neddy out there. On the other hand, I could try to prove that Neddy exists by going to Siberia and finding him, and likewise, you could try to prove that he doesn't exist by going to Siberia and confirming that he isn't there. The point is, neither of us can be certain that Neddy does/doesn't exist until we've seen him for ourselves, or proven that he isn't in Siberia.
So, what do you think? Could the ponies be real, and out there somewhere?</conspiracynut>