Dark Humor

Alright listen up, genius. The joke is that dark humor, which is supposed to be funny, is being compared to a kid with cancer, which is definitely NOT funny. The punchline, "It never gets old," is a twisted way of saying that the humor, like the kid's illness, is always fresh and relevant, but in a super messed up way. You probably think wearing socks with sandals is a fashion statement, don't you?