Oldest one I can think of...
(background...) I used to go over to my childhood friend's house all the time. Fun. I would play with her and her brother. (end)
I have this re-occuring dream to this day. I was 5 or 6 in the dream (its that old, still creepy) I was over at their house over night. I woke up in the dream. (upstairs) My friend wasn't in the room at all. So I go to look for her. I start into her brother's room thinking maybe she was in there. No. Neither was her brother... This is where I start freaking out a bit. I go check the middle bedroom, her parents room. They aren't in there at all either. I back out slowly flipping out that they left me in their home, in the dark. Then... Out of the middle room, comes this creepy gross looking skeleton thing. Blood covered. I run away into my friends room and start hearing it scrape the door. Creepiest dream EVER.