There was a man and a woman and they lived on a farm. They owned two horses, but they could not tell the difference between them!
One day, the man painted a yellow stripe on the tail of one of the horses. When winter came, and the yellow had washed out from all the rain, the man and woman were left to stand there next to each other, staring at the horses.
After two minutes of staring, the woman finally said, “I’ve got it! The black horse is taller than the white horse!”