A blonde had two horses, but she couldn't tell them apart. So she
asked her neighbor for advice. He suggested that she cut the tail off
one of the horses. This worked until the other horse snagged his tail
on a fence. So the neighbor suggested notching one of the horses' ear.
This worked until the other horse snagged his ear on a fence. So the
neighbor suggested measuring the heights of the horses. And sure
enough, the white horse was two inches taller than the black horse.