Like many others have said already, I fear, spiders (a bit less so than in the past)i.e., I was playing Legend of Zelda Twilight Princess, saw the first skulltula, dropped the wiimote, turned the wii off, left the room, didn't go near the wii, or the room for that matter, for around 3 days. I finally worked up the courage courage to play the game and did so, and of course, Out of fear, I never let a single skulltula do damage to link. I would sometimes spend like 3 minutes in battle with a single one to make sure it didn't touch anything other than my sword or shield. Oh, and it doesn't help that I am currently staying in the basement because of a lack of rooms, which has cobwebs all over the ceiling.
I'm not a fan of walking around in darkness, or being overly exposed in darkness. I like sleeping without light, but I want to be as immersed in my covers as possible if it is completely dark.
Being completely alone in a house or home, other than my personal room or which without the tv on. Sometimes, computer can stave me over, but if I am in the living room and no one is home, I sure as hell don't wanna be there unless the tv is keeping me company, especially if it is dark. I like it to be something loud and continuously making talking noise, whish is why computer doesn't cut it in a big room like that.
That's about all that I can think of for now, and I may edit some more in later.