So you filled your hands

Hmm -- interesting comment left on a post at fantasy, about what constitutes fantasy as a genre:

Mundane contemporary fiction: things that could be happening now
Mundane historical fiction: things that could have happened back then
Science fiction: things that haven't happened yet, but maybe (as far as the author's awareness of science goes) could happen in the future
Fantasy: things that couldn't happen in the world that we know at any period of time

It's a common conversation, and maybe it's not an assessment I find too much fault with, on the surface. (I would think that someone's personal belief about the supernatural and also human capability would throw considerable wrenches into the uniformity or universality of any such definition... but, I am sleepy now and cannot properly brain.)