I love that joke.
It’s very simple and elegant in form (if somewhat morbid in subject). Unlike an ordinary joke it has no setup i.e. it does not create an expectation and then break it. Classic one liners are usually just aphorisms that don’t evoke a story. They just restate something that people already believe true in an interesting way. In this joke, a single continuous sentence causes an entire scene to unfold in the listeners mind.
Can anyone think of a similar joke? I’m starting a collection.