I'm going to come right out and say it -- I'm a big, fat scaredy-cat. I am (woefully) an easy scare. There is very little effort required in getting me to shriek at the top of my lungs from a sudden noise or make me feel just ... spooked.
Now, I realize it's just a game, but keep in mind that I'm the person who nearly cried the first time I saw The Grudge because I was so terrified. There have been more than a few instances where I've been creeped out (gigantic spiders, anyone?), but the one part of the game that actually made me uncomfortably frightened is going into Hrothgar's Landing, due north of the Argent Tournament Grounds. It's got everything I hate: lessened visibility, the feeling of claustrophobia (from the mists) and very deep and dark waters. It actually got to a point where I would abandon those dailies unless someone was with me, as I would just get too nervous to do them.
Have there been any times when you have been genuinely scared in game? Does the Scourge make your skin crawl? Do Nerubians make your blood run cold? Or are you just afraid of the dark?