I listened to the Comcast representative call on soundcloud recently, and although it was infuriating, I couldn't help but start laughing out of sheer disbelief. Other things that seriously aggravate me may lead to me laughing in exasperation, but I don't think of "exasperation" as necessarily including laughter. Is there a word for this kind of laughter, or for anger that is so intense that it causes laughter?