Before they finally patched the hole, I used to enjoy running through crowds of high level monsters in dungeons to get a whole parade of them chasing me, then quickly casting a portal into the middle of town, usually next to the bank, then ducking behind the portal without going through, as the whole line of monsters walked towards me and popped through the portal and into town!
Also, you could tame animals to make them your pets.
So one Halloween I logged into UO, and my character had been transformed into a deer, as some kind of a sick joke! All my inventory was gone, and all I could do was deer stuff.
Then some bastard came along and TAMED ME. That totally sucked! I had to follow him around obediently all day. I guess I'm lucky he didn't skin me and make me into leather armor.
