From the Daily Beast

“McCain immediately turned to the woman and said between clenched teeth: ‘DON’T TOUCH ME.’ The woman started to explain...McCain interrupted her: ‘DON’T TOUCH ME,’ he repeated viciously. The woman again tried to explain. ‘DO YOU KNOW WHO I AM? DO YOU KNOW WHO YOU’RE TALKING TO?’ McCain continued, his voice rising and his hands now raised in the ‘bring it on’ position. He was red-faced. By this time all the action at the table had stopped. I was completely shocked. McCain had totally lost it, and in the space of about ten seconds. ‘Sir, you must be courteous to the other players at the table,’ the pit boss said to McCain. “DO YOU KNOW WHO I AM? ASK ANYBODY AROUND HERE WHO I AM.”

McCain had a little blow up in 2006 when he was addressing the AFL-CIO BCTD conference, where he made the mistake of using the then-popular Republican talking point about "jobs Americans won't do."