Muhummad Ali was not only one of the greatest athletes of all time, he was also famed for the way he talked himself up. "I am the Greatest!" he would say. One day he boarded a plane but refused to fasten his seatbelt. The flight attendants politely requested that he do so, on a number of occasions, but each time Ali refused, til finally he said, "Superman don't need no seatbelt."
"Yes, and Superman don't need no airplane" replied the flight attendant.
Source: Unknown. Adapted from John Ortberg, The Life You've Always Wanted
Applications: pride, ego, hubris, greatness