Accidents like this are why I prefer dirtbikes. The bike is just as fast, just as powerful (though granted not as quiet), but is far more predictable. It always does exactly what you tell it to, no matter what the consequences.
Yeah, like run INTO something, or off into a ditch or hole, or . . .
Horses will stay upright on their own and not *usually* run into things (some are smarter than others). The more sensible ones will keep you from taking stupid risks.
Also, a horse can jump a fence or a stone wall without the aid of a dirt ramp.