Force People to do Impossible Tasks
Make a server, and make the name "fun DM Join mini or ban" but don't make a minigame and when people don't join the minigame that doesn't exist, ban them and say they can't read. :D (This happend to me once, it made me laugh cuz I was banned for like 5 mins.)
Zombie DM with a Twist
Make a DM and add zombies but give everyone brooms and make the Dm on one 32x32 plate high up in the air. Use gravity to kill the zombies.