A. Knock Knock.
B. Who’s there?
A. Amy Fisher.
A. Amy Fishe…?
B. … BANG!
This was only a couple years after a girl named Amy Fisher went to the door of the house of a man named Joey Buttafuco, whom she was having an affair with. She asked him to leave his wife and when he refused she went to his house and shot his wife in the head. This can be an example of a kind of disaster joke, these are risky because for a certain time after the initial incident, people can find the joke inappropriate.