We speak of madness when someone is in a fit of anger, and being smitten when someone is in love(with someone), etc. But what about when someone just can't stop laughing? i.e, when someone is "cracking-up" - is there a more formal word?
We speak of hysterical laughter.
They are amused. Defined as being entertained by something.
I would say, if the news anchor was uncontrollably laughing at a castrated man, his sense of humor would be macabre. Thus, placing his uncontrolled laughter at deranged laughter.