At recess, three second graders meet by the slide. One is Korean, one is white, and one is black. They decide to compare the size of their urinary equipment.
The Korean shows off his first. Then the white guy pulls out his, and the Korean is shamed, but not by much. Then the black unzips his pants and the Korean and white stare in shock at the size...
Later that evening, the black is at home and his mother asks him if he learned anything at school that day. He says "well, I learned that I have a bigger dick than white and Korean boys. Is that because I'm black, Mom?"
His mother replies, "No, Son, it's because you are 17."