Humm I've had a few bad ones but here is the worst. Ok so it was a really really new server like still in buliding stages and I has applied to become a helper and I got though so I joined it and I wasent the only one who got it. So there was about 5-8 of us at spawn since it was the only thing there. We chated and tested plug-ins for a bit. Then the owner had to leave. This one player kept spawning killer bunnys and gardians at first it was actually very fun trying to survive but he would not stop causing a TON of lag! Then he flew around in creative killing people and spawn killing placing lava and stuff braking blocks placing TNT then he made a TNT room and teleported all of us into it Then blew it up he did that a ton of times so there where holes EVERY WHERE and all of us were yelling and screaming and trying SO hard to get him to stop. Then he spawned 3 ender dragons and like 5 withers. Witch caused a TON more lag and I had 1-5 FPS then a few of us found a safe place. And there was a room and you could see ice that melted into water but we had to brake cobble stone walls with our fists (by our I mean it was just me) so I finally got free and it was a W.E world so it was nothing but bedrock and I ran and ran and ran and ran till I started to starve to death. Then the person noticed some of us where missing so he teleported all of us back and he broke the floor where you'd spawn so it was an death trap. I forgot to mention he demoted all of us and gave himself a really high rank. It was mental tourture