This girl was home all alone watching TV on a cold winter night. The television was right beside a sliding glass door, and the blinds were open.
Suddenly she saw a wrinkled old man staring at her through the glass! She screamed, then grabbed the phone next to the couch and pulled a blanket over her head so the guy couldn’t see her while she called the police. She was so terrified that she remained under the blanket until the police got there.
It had snowed a lot during the day, so the police naturally decided to look for footprints. But there were no footprints at all on the snowy ground outside the sliding door.
Puzzled, the police went back inside the house – and that’s when they saw the wet footprints on the floor leading up to the couch where the girl was still sitting.
The policemen looked at each other nervously. “Miss, you’re extremely lucky,” one of them finally said to her.
“Why?” she asked.
“Because,” he said, “the man wasn’t outside at all. He was in here, standing right behind the couch! What you saw in the window was his reflection.”
This story is from : http://urbanlegends.about.com/od/horrors/fl/The-Killer-in-the-Window.htm