Once a man stole (偷) one of George Washington's horses. Washington went with a policeman to get back the horse. But the man didn't give the horse back to Washington. He said that it was his horse.
Washington placed his hands over the eyes of the horse and said to the man, "If this is your horse, you must tell us in which eye he is blind."
"In the right eye!" the man said.
Washington took his hand from the right eye of the horse and showed the policeman that the horse was not blind in the right eye.
"Oh, I made a mistake," said the man. "He is blind in the left eye."
Washington then took his hand from the left eye of the horse. It was not blind in the left eye, either.
"I made another mistake," said the man.
"Yes," said the policeman. "And you know the horse is not yours. You must give it back to Washington."