I'm not afraid of much, but the things that I've been afraid of are quite extreme.
The first occured when I was around three years old. My family had one of those insanely out of the way houses, the kind that horror film directors have a total love for. My sister, around sixteen at the time, was babysitting me. I was sitting out back, on one of those little springy horses, and she had gone inside for something. I turned, because I heard something scrape on the doorframe, and saw the scariest image I've ever witnessed.
It was as if there was a hole in exsistance, the shape and size of a man. But it seemed to be bursting the doorframe, as well. It was tough to comprehend, and it seemed to radiate cold and hatred. When I closed my eyes, and opened them, it was gone.
But just the feeling of hatred - it scares me to this day.
The second occured in the same house, when I was around sixteen. Around 10:00pm, while I slept in my bedroom (adjacent to the living room, where the rest of my family was sitting), my bed leapt around two feet into the air, and came down - obviously waking me up. After some heinous freaking out, since my family heard the noise, I managed to get back to sleep.
During the night, my sister came to check on me, and said that my room was deathly cold. She could see her breath in it, and there was frost on all metal things. So she just closed the door, and ran.
When I woke up the next morning, the back of my head and pillow were caked with blood. I assumed it was my own, though I couldn't find any wounds.
Thankfully, I don't live in that house anymore.