My blonde joke:

A blonde inherits a horse ranch, with two horses, from a dying uncle. Unfortunately she can't tell them apart, so she goes to her neighbors for help. Her first neighbor tells her to trim the tail of one of the horses. This works well until the second horse gets its tail caught in a bush and needs to be cut out. So she goes to her second neighbor and is told to clip the ear of one of the horses. This works well until the second horse gets its ear caught on a fence. Her third neighbor tells her to measure her horses. She measures her horses and sure enough, he black one is 2 inches taller than the white one.