So you have come across yet another hoi4 thread. Well. What should you do?
There are two options available.
Option 1. This is the easiest. Just crap on it. make some very low effort post. The lower effort the better. Examples would include posting some random word, like "beaver" or "penis" or egg". Or just randomly insult someone. Doesn't matter who. Tell them to "shut up" or "schizo" or "rent free". Whatever, its doesn't really matter, they are likely to make some equally asinine post back, thus further shitting up a shitty thread.
Option 2. This is harder but far more insidious. Just make another hoi4 thread. Again, the lower effort the better. Using the standard hoi4 screen cap and something equally moronic like "Is hoi4 gud?" or "why is this so gud?" Then never reply to it again, other than to do Option (1). Yes that's right, crap on your own crappy thread.
A slight variation which might prove more entertaining is to create a fictitious mod. Again with the low effort. Something like "Who likes the KAP mod? Its great!" Invariably some chucklefuck will ask about it and you tell them its the "Kaiser Anal Prolapse" mod where events are based around diseases of the rectum.