I wish this thread had gained more traction, so I have another story to share.

Yesterday, my two FC mates and I stumbled across White Joker in Central Shroud after coming out of a dungeon. We were leveling alt classes, so we had to wait around for everything to cool down before we could fight him. Meanwhile, this mid-20 Arcanist wanders by, curious of what's happening. Fortunately, they don't aggro White Joker and we invite them to the party for the fight. We take him down, bow to each other, and go our separate ways. It was fun.