In retail vanilla WoW, a month after WoW launched, me and 4 of my guildies were leveling in STV when we saw a ?? dwarf (well what we thought was a dwarf) chilling near the river. He started dancing with us and giving us hugs and then promptly killed every single one of us. In guild chat we were going crazy and thought it was some kind of hack or bug. We asked the "dwarf" why he's killing his own faction and he would just /lol and kill us all again. We kept trying to communicate and ended up with the same result. Death. We all decided one of us should make a ticket and steer clear of that dwarf for a while and level somewhere else. An hour later, a GM talked to me and told me it was a member of the horde using an item called the Orb of Deception. I told my guildies and we all couldn't stop laughing about it. That's the memory I remember most from my vanilla wow days. It's funny since all 5 of us had that same derp moment. :o

