That sounds like a lot of fun! I have had a few experiences in dungeons that were just silly

I had a run in CM where I was one of two tanks. Just outside of the first boss, one healer was trailing behind and aggro'd the guards at the door to the boss. Tank instincts kicking in, I rushed out to grab hate, only to have the gate lock the moment I stepped outside.

We probably should have just died and come back. But heck no, that healer and I tangled with 3 mobs for the whole duration of the boss fight.

Of course there was also the time 3 BLM healed me through both forms of the Ultima Weapon and Lahabrea.... Only 3 DPS survived into the Ultima DPS race and they nailed it!