A few miles along, the horse stumbles. The man stops the horse, walks around, and sticks his finger in the horse's face, and says: "That's one." And walks back in. His wife is perplexed... but doesn't say anything and they keep moving on.
After a few miles, the horse stumbles again. The man does the same thing, stopping the horse, going around, sticking two fingers in the horse's face and saying: "That's two." And walks back in. His wife continues to be totally confused, but she says nothing again, and they move on.
A few miles later, the horse stumbles a third time. This time, the man stops the carriage, and goes back, grabs a shotgun and shoots the horse in the head. He goes back in, and his wife says: "Why in the world did you do that!?"
He points one finger in her face and says: "That's one."
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