A server I used to go on had no storage on the reports, so if you reported and the mod/admin slayed you. too bad, the report would never be opened again and the mods had power to ban without a real explanation. Got banned for rdming and writing the lyrics to Rickrolled
Not a rule, but I played on a server once where the only map was minecraft b5 and every time someone said anything in the spectator chat the server crashed