Somebody once tried to get away with telling us the belts contained the Japanese translation of our username. A moderator put the joker right though. If it hadn't been for the thread that describes them... we would have probably all believed him. Haha.
I notice it can't be correct though. It says that 500 posts gives you the brown belt, "Hakushaku (count)" but I have 523 posts and I still have a blue belt, "Shishaku (viscount)"