I've seen this crop up a few times on the interwebs, where the "truth" about a given story is that one of the characters is simply dreaming the whole thing up. Normally while comatose or suffering from some kind of mental disorder. Examples include but are probably not limited to Adventure Time and Foster's Home for Imaginary Friends.
I have to ask, what's the point? I get shipping, more or less. We care about characters and think x would pair well with y. I also get "fixing" a story so your favorite character is more important because we all have favorites.
But to posit that all events of a story (as opposed to isolated dream episodes and arcs) are the results of a character's imagination is...pointless because we already know it's not real. Is the delusional/insane character merely a stand-in for the people who write the show? An inability to accept stories with fantastic elements as part of their premise? Can someone explain it to me.