We Find Discrimination Everywhere!
In his latest book for the non-scientific layman, Leonard Mlodinow (See* below) recounts a joke in his discussion of the stereo-typing and categorization of people. As Mlodinow tells it, three gentlemen (a white Catholic, a white Jew, and a poor black man) die and head for the gate of heaven where the Lord will question them to determine their qualifications for entry.