OMFG THAT WAS SO FUNNY! I could see that being used everywhere. I'd imagine one of the worst parties would look like this when the Party-o-meter evaluates it:
The party that you are about to enter is worse then dying and going to hell. In Mount Zhayolm the WAR66/MNK3 will somehow aggro an Apkallu and it will wipe half of your party. The BLM will disband, calling the WAR "worse then the dumbest RMT". Apparently, a shouting match in Aht Urghan Whitegate takes place between the WAR and the BLM, in which several bystanders are called retards for shouting something completely unrelated.
Your replacement is a PLD67/WAR5 with AF weapon and a Marine Shield. During the first fight, the PLD faces the mages and the eruca uses Incinerate, dropping the PLD, the WHM, and the SMN65/PLD1. You decide to go to Bibiki Bay.
After 3 fights, the SMN will go afk while having Ramuh out. A hobgoblin shows up, ramuh attacks it, and the goblin uses suicide Bomb and murders your entire party. Oddly, the SMN evades it. She comes back and says "What, everyone decided it was nap time? Get up, you lazy retards!"
After 5 more fights, somebody runs past your party with a massive amount of NMs. I'm not entirely sure, but I think I saw Absolute Virtue, Leaping Lizzy, Intulo, Adamantoise, Luigi, and Bowser, as well as several others. I'm not even sure how something like this could be made, especially since Luigi and Bowser aren't even in this game, but your party wipes nonetheless. You reraise, Adamantoise spots you, and sits on your party for eternity.
I do not recommend you join this party.
That would not be a good party. O_o