I ain't no...

This one is a classic so I will add it now:

Man A: "Mang, I cut my self, mang!"

Man B: "That looks bad. Why don't you go up to the Emergency Room?"

Man A: "I be aight."

Man B: "But it's right upstairs, they can look at it right now."

Man A: "I AIN'T NO WOMAN, MANG!"