Our universe is just a simulation because I read about it in the news ''NO! NO! WAIT! DON'T LEAVE ! DON'T LEAVE MEEEEE! THERE'S MORE! THERE'S MOOOOOOOOOOOOOOOOOOOOOOooooore. ''Anyway.
It has been speculated that the universe is one of three shapes: spherical, plane, or saddle-shaped. As we all know, the Earth is flat, and since it would be uncreative and less than perfect to reuse the same pattern, the universe must not be a plane. The universe can't be a sphere, because that's just weird. Why the fuck would anything in space be sphere-shaped? Balls are spherical, and the universe doesn't smell like balls, so that eliminates spheres.
This leaves the saddle shape. Thus, the rest of existence is a horse (probably a My Little Pony), and we're being sat on. Gravity is just the fat mass of the 4-dimensional being squatting down on its cushion. I mean, it's only logical. (Reference: Star Ocean 3.)
''Hey! ''Hey is for horses.
Don't you say "NEIGH!" at me!