As my teacher would say, 'it lacks internal logic.' Or to say it in a simpler way, 'that looks incredibly stupid.' Generally, an appliance, successfully used, involves well, brief use, but also acts on only one action that is something the horse is having a lot of trouble with. So, for example, a running martingale for a horse that is tossing its head up in the air suddenly and forcefully. This looks more like someone just rigged up the kitchen sink and threw it at the horse.