"The Haircut" joke

This guy goes into a barber shop, and says, "I want my hair cut, so that it's long here, here, here, and here..., sort of wavy in this section but straight just below, sort of spiked on this diagonal with a slanted taper, and bald patches here, here, here, and here." The barber looked at him and said, "I don't think I can do that!" "Why not?" said the guy. "You did the last time I was here!"