I'd have to say that one of my greatest parties occurred with a couple of hitchhikers.

I really don't remember what the circumstances were at the time other than it was me and someone else rumaging around Raque Island when lo and behold, Snafu, Avis, and Iceblink appeared in my backpack.  Snafu kind of served as my "conscience (as much as he possibly could)" and guided me around the island.

One of my other favorite parites was a wizard party that I got to lead with about 15 other wizards.  I forgot for whom we did the quest, but someone hadn't done Secret Police, so we decided to get someone a membership.  It was a fun trip, though we did suffer many deaths.  Quite fun, nonetheless.

I don't remember much from 9.5 years ago, but I remember the old damnie Morgan taking me under his wing when I first started.  I think within a week of me playing, I got Chuck to start and then he got a bunch of people from his dorm playing (Toupee, etc).  It was a grand old time with the Madison druids before the guild got severely hacked up.

Remember when you could pump your hps in Gruhl's area?  I remember messing around with Terwin trying to get uber hps.  I think Ysidro was the master of this though.

Old kniggets kicked some serious butt.  Combination of berserk and fireball was a ton of fun.  

Gotta love the old Chaos guild.  Nothing better than turning everyone into a bunch of chickens.

I remember being a testplayer for Avis' lepers with Photon and then being able to slip through the cracks and keep the character even though the other testplayers were deleted.