A man wanted to buy a horse for his niece, so he drove out to a horse ranch. He told the owner that he wanted to buy a nice, docile horse that his niece could easily ride.
The rancher brought out what he said was the most docile of all of his horses. The man liked it, but then he noticed something odd about the horse. "Hey," he said, "this horse only has three legs."
The rancher replied, "That's right." And then asked, "So how old is your niece?"
"Perfect," the rancher replied, "then you can just tell her that the horse's father was a flamingo."