Mushroom

Jim: Joe, I hear you just got married again.
 Joe: Yes, for the fourth time.

 Jim: What happened to your first three wives?
 Joe: They all died, Jim.

 Jim: How did that happen?
 Joe: My first wife ate poison mushrooms.

 Jim: How terrible! And your second?
 Joe: She ate poison mushrooms.

 Jim: And your third ate poison mushrooms too?
 Joe: Oh, no. She died of a broken neck.

 Jim: I see, an accident.
 Joe: Not exactly. She wouldn't eat her mushrooms.