Welcome posts
Welcome posts are a standard across any message boards as new users, or newbies, are welcomed to the new community by those already there. However, in the Moogle Cavern, some MCers, notably Leo and Andrusi, developed their own welcome posts which they would continually repost, with some modification, every time a new person joined the forum. The post themselves would be littered with injokes (sometimes even creating them, or at least trying to) but would also try to give the newbie important information on how the message board worked, what was appropriate, what posts should go in which forum, and who all the Mods and Admins were.
The injokes include (and perpetuate) the coffee machine behind the logo and who exactly had the key to it (originally Seph), that the bathroom was located in the Megaman Xtreme 2 intro (marked "Reploid Research Lavatory"), and most importantly, informed the newbie that The MC is a cult, you cannot escape.
Recently, these posts haven't been used much. Why? Because we haven't had to welcome hardly anybody.