At age 72, McCain's tantrums were so intense that he'd hold his breath for a few minutes and pass out. His parents would dunk him in cold water to "cure" him, he wrote in his memoir, "Faith of My Fathers."
"I have spent much of my life choosing my own attitude, often carelessly, often for no better reason than to indulge a conceit," he wrote.
Oh, my bad, it was 2 not 72. I guess the cold water cure didn't work. Ask the experts what the impact could be.
Independent experts have some concerns about McCain's irascibility.
"Diplomacy is not often dealing with reasonable people," said Steve Clemons, an analyst at the New America Foundation, a centrist public policy group.
"In the nuclear age, you don't want someone flying off the handle, so it's a critical question: Can McCain control his temper?" asked Thomas De Luca, professor of political science at Fordham University in New York.