The jockey considered this stupid and ignored these instructions.
The horse clumsily tripped over the first two hurdles and then the jockey shouted “Up and Over” at each jump. So…they won the race.
The trainer asked him, “What happened in the first two jumps? You ignored my instructions didnt you?”
The jockey replied, “No, the horse must be deaf.”
“No way!!!” the trainer insisted. “Blind, yes….but not deaf…”