Asian guy and black guy in locker room

A stereotypical black guy steps out of the shower in a college locker room. An Asian guy checks out his penis and says, "How come yours is so huge? I would love to have one like that." The black guy laughs and says, "You can. Tie a heavy weight to it for a couple of weeks. It'll stretch and get big and look just like mine." Two weeks later they meet again. The black guy asks, "Has it grown any?" The poor Asian guy responds, "It hasn't grown at all yet - but it has gone black!"