Its damn near impossible.
Possibilities:
1) Set your avatar pic to this, and start calling the moderators nazis everywhere
2) Set your avatar pic to pedobear, and start spamming the forum with pedo jokes
3) Start a group buy, collect lots of deposits, then leg it with everyone's money
4) Abuse everyone (mainly moderators) for years on end
Option 4 I know has resulted in a Ban. Option 3 I *think* ended in a ban last time. Option 1 got me a warn, but not quite a ban. I expect they will be harsher next time (May well get me banned too ). Option 2 is based on the new forum rules, they seem to oppose pedo bear a lot for some reason