Every community has its traditions, The Discworld MUD is no different. In fact there are traditions that broach the whole userbase, players and creators alike, as well as traditions specific to individual subgroups.
At least one player's character should be rmplayered by a trustee at each RoundWorld MUDMeet.
All future projects, particularly the ones players are baying for, are to be ready by Thursday. Which particular Thursday is never mentioned until it is in the past and the project is in-game. Newly recruited creators are usually killed in varied and humorous ways. Players are not to be killed directly, but simply allowed to kill themselves by making use of your code. Simply making an 'instadeath' thing is no fun, making an 'instadeath' thing and telling the players it's there and letting them kill themselves anyway is fun (c.f. The wall in the netherworld)
Threaten to leave in a drove at the hint of change, but generally stay since it's not so bad after-all once the change happens.
Laugh at people who get lost in L-space
Pretend that theirs is a real guild.
Go PK and say that!