We (http://pr0gramm.com) had a multiplayer battleship[1] for our april's fools two days ago. All users were divided into a red and blue team and then voted for the next shot. For our april's fools in 2018 we did the same with connect 4[2].

The games itself are not that interesting (altough OP certainly disagrees), but the social dynamics, shitposts and memes that came out of this were fascinating.

[1] https://vid.pr0gramm.com/2022/04/02/e9c168457179b582.mp4

[2] https://vid.pr0gramm.com/2018/04/01/fa0b52dacd80da53.mp4