Haha, if you're going to watch it, then watch the ordering. It didn't air in chronological order (it aired completely messed up, actually XD), so episode 0 isn't actually the first XD And so on. If you're watching it on an anime site, it should say which one is first by the episode name, although the sites will list it in *aired* order.
Like here. Ep 1 is actually the 2nd to be aired XD Ep 7 is 4th XD Completely random