Here's my story, sad but very true. Thought I'd share it because it wasn't exactly funny at the time, but I think it somewhat so now.
Typical Sunday afternoon VoN 5 outting on hard with a very well balanced group, including a bard and three clerics, ranging from levels 10 - 12. I'm playing as my 12th level ranger, whom you may know as Roinalcarwe. One of our clerics had the star, but he wasn't saying much through either VC or PC, so a 12 fighter (who happens to also be a guild leader) took the de facto con. Things proceeded quite smoothly even with his lost connection, though I attribute this primarily to my grabbing the arcane signet ring and Hayward's voice, doing the wheels, making sure the power conduits got turned on, fixing the puzzle (which our leader was doing incorrectly throughout), and generally ensuring everything other than killing all creatures in sight got accomplished. I even dropped the ladders in the south room by myself (jump and evasion are wonderful things).
We get to Arach's Knight; various members of the party are getting last minute potions and mana. Unbeknownst to anyone, we had a sorceror who had never done VoN before. He talks to Arach... before two of our three clerics are back and before anyone has any buffs on.

9 people are inside. We drop the Knight easily enough, but after rezzing and healing, our lone cleric has 3/4 of a mana bar left. OK, you're thinking "idiot, why didn't you tell him not to talk to Arach?" *sigh* Our leader decides to proceed into VoN 6 on normal.
I was undoubtedly more qualified for the job, but our fighter commander decided to run the bases. I will merely say that his build is - questionable - without going into details... he had significant trouble with the flensers, and the mephits killed him outright on second. Our brave cleric, now with half a bar of blue, gets him back up. Now I've heard of this happening, never actually having seen it until then, but the earth elementals
knocked him off the bridge. The merry gathering down to 8 at this point, we send out another (much more capable fighter) to finish the job. Then the unthinkable happens - whether it was lag, or a matter of spazzing out, who's to say... the
cleric falls off the bridge and perishes in the fires of atmospheric re-entry. And the bard can't UMD rez scrolls because he has none.
I promptly recalled and left party. It wasn't a failure, technically, since Velah or her minions didn't wipe us
