You know why?

A young black boy goes into the kitchen where his mother is baking.
 
He puts his hands in the flour and coats his face with it.
He looks at his mother and says
"Look Momma, I'm a white boy." His mother slaps him hard
on the face
and says "Boy, go show your Daddy."
 
The boy goes into the living room and says
"Look Daddy, I'm a white boy." His Daddy slaps him on the face, too and says,
"Boy, go show your grandmother."
 
So the boy goes to see his grandma and says
"Look Granny, I'm a white boy."
She slaps him on the face and sends him back to his mother.
 
His mother says
"Well, did you learn something from all this?"
 
The boy shakes his head and says
"I sure nuff did, I've only been a white boy for five minutes
and I already hate you black people". 
  
  고교동창회 홈피에서 가져옴.