system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does Spider-man always pop up in incest threads on 4chan?
gpt
It's a running joke. A long while back there was an incest thread on 4Chan, and someone decided they would take it over with Spiderman memes. This caught on very quickly, and it became law that all incest threads are fair game to be taken over by Spiderman.