Bloody Son-Day

F: Speaking of horrible parenting, did you know that Ivan the Terrible killed his son?
B: Yeah! I remember hearing about that!
J: Intentionally? How?
F: Well, as I remember...apparently, the son did something to make his father angry, so Ivan the Terrible clubbed him on the head. Maybe it was with a sceptor or something. But anyways, he hit harder than he'd intended and killed him.
B: That's terrible.
F: Well, he didn't mean to do it.
J: Ordinarily he would never harm a heir on his head.
F: That's how it goes. Heir today, gone tomorrow.
J: *groan*
F: It was a heir-raising experience.
J: Except not.