I've told this story several times, and it's still my scariest experience ever:
I was about seven or eight years old.
I woke up in the middle of the night, and descended from my top bunk to the floor and headed to the restroom. *skips stuff* Once I finished, I walked back to my room. As I entered the room, I turned my head to the right for no particular reason, and then saw a small silhouette in the dark with bright green eyes, which was laughing at me in the creepiest of ways. I quickly ran into my parents room, and asked to spend the night there, but it wasn't over. I continued to hear whatever it was laughing and gurgling from my parents' restroom, and it appeared only I was able to hear it. After that night, nothing so daunting ever occurred to me again.