Hmm...Actually not a bad question at all.

The first clan I joined was BK (Black Knights). It seemed to be a popular clan and my friend, KnightLord, had already joined. So I decided to join as well. It was fun, despite the slanted levels. Eventually, the clan (and, sadly, in real life, the leader) died, so I merged what was left of it into AT.

The second clan I joined was AT (which actually doesn't stand for anything). I joined (and merged the dying BK into it) because I liked the ideas it presented. The ideas were friendliness towards other clans, lenient leading, and a more pro-creativity look about Jazz. These days, there aren't many clans that do more JCS than battling.

The third clan I joined was CC (Cracco Clan). I joined because the levels and leader were nice. And KnightLord also joined. I merged (yet again) AT into CC.

I actually joined 50+ clans as a bet to KnightLord. So many, I had to bring a second character into servers to fit my name. I ended up qutting them all, and most have died. I was in GpW for about ten seconds as well, and DL for about a half a second, both as a joke.