Comedian, entertainer and commentator Joan Rivers died Thursday. She was 81.

Because of this, there is probably going to be a lot of pieces on her that you will see over the coming days and weeks about Joan. This video is a clip from the documentary "Joan Rivers: A Piece of Work."

The clip starts out with Joan doing stand-up and telling what may be considered a controversial joke.

This joke leads to some back and forth with Joan and a heckler in the crowd. Joan then tries to explain to the man what comedy is.

After the show, a female fan brought up the situation. Joan explained she felt bad for what the man was going through, but he just needed to understand exactly what comedy was.

What Comedy Is About, According to Joan Rivers

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