Your eyelids snap open and you sit up. Your heart is beating fast and a cold sweat is running down your back. You glance at the clock on your desk. It was 3:00 AM. You try to analyze what scared you so much and why you woke up at all, but suddenly you feel that something is wrong. Running your eyes around your room, you come across the window that you forgot to close with curtains today. Your eyes filled with horror and your insides clenched. Not because you forgot to close the window with curtains, but because of what was outside the window. A thin and tall man in a strict funeral suit was almost right next to your window glass. He was slightly hunched over and looking right into your window, if you can call it that. What scared you the most was his face. Or rather, its absence. A pale, almost paper-white oval face stared motionless at you. It didn't try to break the glass or attack. It just stood there and watched. The creature slowly raised its long arm and tapped a white, sharp finger on your glass. Suddenly you realized why you were awake. It was that damn quiet "knock-knock-knock" that sounded like thunder in the stillness of the night.