knock-knock-5
Explanation
This comic takes the familiar knock-knock joke format and places it in a post-apocalyptic setting. One survivor knocks on another's door:
"Knock knock." / "Who's there?" / "Dave." / "Dave who?" / "Dave who is the only other survivor of the apocalypse."
The punchline subverts the knock-knock format entirely -- instead of a wordplay punchline, Dave is genuinely identifying himself as the only other living person. The follow-up adds a layer of dark humor: "I mean, who else could it possibly be? They're all dead." The person inside responds wistfully, "I keep hoping" -- suggesting they keep hoping someone else survived, which is why they still bother asking "who's there?" at all.
The comic finds humor in the absurdity of maintaining social rituals (like knock-knock jokes and door etiquette) in a context where they've lost all practical purpose. It also carries a note of genuine pathos -- the survivor inside clings to the ritual because it preserves hope that the world isn't as empty as it seems.