Bathroom Monologue: “The man that cannot visualize a horse galloping on a tomato is an idiot.” -Andre Breton

-A horse shot with a shrink ray, such that it fits on the surface of the tomato; an optional gravitational field generator may replace the seeds, so that the horse can circle the entire tomato.
-A tomato is shot with a growth ray, until you could build a pasture on it, and horses are left to gallop at will.
-For a single step in the gallop, a horse's hoof lands on (and probably crushes) a tomato, thus technically galloping upon it.
-A floating, indestructible tomato levitates and moves at an incredible speed in a chasm as a horse jumps into it. The tomato levitates to every spot where the horse's hooves go down, moving near the speed of light such that it provides nearly simultaneous support to all the limbs at rest, and provides momentary stable points for the legs to propel the horse forward, thus preventing it from falling into the chasm, and allowing it to cross said-chasm.
-A horse gallops across a country that happens to be named "Tomato."
-A horse gallops across a massive painting of a tomato, laid flat on the ground.
-A flea, named "A. Horse," scrambles across a tomato.