Four-year-old boy: Dad, if I die, when will I come back?
Father: As far as I know, you won't.
Four-year-old boy, untroubled, thoughtful: But…what if everyone dies?
Father: Well, other people will take their place. Because everyone doesn't die at once. Know what I mean?
Four-year-old boy: Where will we put mom if she dies?
Mother, just arriving: Good grief!
Father: In the ground. In a box in the ground.

–Barnes & Noble