BICYCLES AND HORSES don’t mix. To a horse, a person on a bicycle is a witch on a broom zooming sideways, a phantom. It does what any spooked horse would do. It rears up, bares its teeth and punches the air with its hooves.Put yourself in the horse’s shoes. Imagine you’re minding your business one morning, munching purple chicory and clover, and a chimpanzee pedals by on a flying tricycle or some fairy buzzes down from the sky, flapping her wings in your ears. Wouldn’t you want to swat her?