Wish I had one like yours

A white man noticed the impressive length of the black man's penis at the adjacent urinal. "Sure wish I had one like your's."
The black man replied "You can--just tie a string around it and hang weight on the end of the string. Put the weight down your pant leg, and you can have one like mine." The white man thanked him for the suggestion and left.

Some weeks later, they met again in the lavatory. The black man asked how the project was going. "Great--I'm half way there!"
"Really?" said the black man.
"Yes. It's black!"