“If somebody from your world can imagine our world exactly like it is and believe it is fictional, then that still doesn't make our world any less real to us even if it is fictional to you, much in the same way that if somebody switched the roles and imagined your world down to a T, and called it fictional, it is still reality to you. If not, all the infinite parallel universes would be fake, because they would be featured as fiction in another infinite number of parallel universes.
“And if they, including us, are fake, how can we exist?
Yeah, what he said,"
"Upbuhwha?" I respond oh-so-wisely.
The people sighs but resumes his insight without a hitch. "What I'm saying is, just because our world is fictional to you, that does not mean that we see it as any less real. If your world was fictional to us, would you see it as any less real?"
"Uh...I guess not." )
What do you think? That's a pretty good theory.