PLEASE EXPLAIN πŸ˜‚

I'm fairly new here, so I may sound stupid but someone please explain why when someone posts anonymously on CC (which I know is against the rules) people respond with the most fucking random pictures ( usually of their babies???) like...is it a known joke or something to do that when someone posts on anon?? I probably sound so fucking stupid but please explain πŸ˜‚πŸ˜‚πŸ˜‚