Clever Hans the Mathematical Horse: The early 1900's should be forever known as the era in which a horse scammed us all. Clever Hans was its name, and solving math problems was its game. Trainer Wilhelm von Osten would ask the horse various math equations, and Clever Hans would answer by stamping its hoof. The problem? Clever Hans didn't know math at all. He was just a dumb ol' horse. But, he would respond to involuntary cues from von Osten and spectators in order to know when to stop tapping the floor. He made fools of everyone, all for those sweet, sweet congratulatory carrots.