Questing in Mulgore on my first character ever. Another tauren comes up to me and we talk a bit. This was my first MMORPG so I was thrilled about all the other people around me and never hesitated to speak to anyone.
So there we were, just chatting about the game, when all of a sudden two guys on big, shiny horses comes running up to us, SLAUGHTERS the other Tauren in a BRUTAL ASSAULT. I was godsmacked. I just stood there, too scared to move. Then, the guys on the horses laughs (!?) and rides off.
Being the secluded little cow that I am, not even having visited Thunder Bluff yet, I had no idea what just happened. Was it some sort of boss? A quest event? Why did they have yellow name plates? Why did they kill that poor Tauren and left me alive? Maybe they didn't see me?
Later I learned ofc they were human paladins, having fun killing pvp tagged lowbies in the starting areas. To this day, that is by far one of my best WoW memories.