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!"