This a charity event that runs every year: http://fourjobfiesta.com/

The Final Fantasy Five Four Job Fiesta is a challenge play of FF5 where players get one random job from each of the crystal sets in the game.
Examples are on this page: http://fourjobfiesta.com/help.php?s=e

This is a pretty big deal on a lot of gaming communities and I see a lot about it every year. It's going on right now, in fact! Has anyone ever tried it out?