I always erupt about 5-6 feet. From your standard mish position, that translates to eyes, face, hair, headboard, wall. If I am on my back, it's pretty much the same thing, but not as high as the ceiling. I've blasted the walls on the side a few times.
Like someone mentioned, what goes up must come down. How often do you think they steam clean those carpets, and how often have you walked around bare footed on them?