There's an airplane flying from North America to South America...

... after a while over South America the captain makes an announcement: "Dear passengers, in a few minutes we will experience some turbulences, please stay seated and wait for further information!"
Some minutes later the plane shakes and moves from right to left, up and down. The captain again: "Ok, you felt the turbulences; we are too heavy to continue this flight and will have to lose weight immediately in order not to crash and all die! I will open the hatch and have all the luggage dropped. I will be back with further information in a bit."
Again some minutes later it's the captain again: "We dropped all the luggage and unfortunately we are still too heavy. If we don't lose weight right now we will crash and we will all die. We therefore need some passengers to jump off the plane to save the other people's lives. So if you're ready for that committment, please raise your hand! Anyone?"
Nobody. Pilot again: "So, if nobody wants to jump on their own, we will have start in the alphabet and if you're called up please raise your hand and jump! So "A", could please all African people raise their hands?" Nobody. Pilot: "Ok. "B", could please all Black people raise their hands?" Nobody. ""C", could please all Colored people raise their hands?" Still nobody.
There's a young black kid sitting next to his dad, grabs his shirt, pulls and asks: "Daddy, daddy, daddy, why don't we raise our hands? We're African, we're Black and we're Colored!?"
The dad says: "Son, tonight we are Niggers, and we let the Mexicans go first!"