I was flying from MEM to IAH today and had some great entertainment in Memphis. I never did find out the cause for his melt down but he dropped a "I spend over $10,000 a year with UA and have earned some respect from you people" (directed at the GA's). He then dropped a "YOU are to blame for me not getting home to Chicago". He also "demanded" to know their names and became furious when they would not give him their last names. All through this the two GA's remained as calm as I've ever seen, (I think this wound him up even more as they would not get into a shouting match with him). He finally went storming off after they closed the door for the flight he apparently didn't have a confirmed reservation for, Yup, I'm easily entertained.