Lawlz, that's what happened to me, too. Well, sorta;
Oni's like, "URE GOIN 2 BE MODERATOR OV GRAFICS AN ENTERTAINMENT BUT IM GOIN 2 WAIT FEW DAIS 2 MOD U. KTHXBAI".
Then the next time a logged on (a few hours later), I was a mod. I must admit, it was rather confusing.