^ When I read the title to this thread I thought about that movie, haha. I saw it last night.
I haven't had someone knock on my door, but I was lying in bed one night after midnight trying to fall asleep and I heard someone tapping on my bedroom window. Scared the bejeezus out of me. At first I just stayed put, my eyes wide open, hoping it was something else (like what, a tree? there was nothing by my window). Anyhow, I heard someone tap again, louder this time, and I flew out of bed and ran and got my mother (I was in high school at the time). So we peek out the front window and both of us got freaked because there was a man just standing there in our yard.
Turns out, it was my sister's ex-boyfriend. I took over her old bedroom after she moved out, so he gave it a try to see if she was there. It was really scary at first, though!
When we were little kids, my mom and had gone out with her boyfriend for a date and my cousin babysat me and my sister. We had fallen asleep on the couch, so when my mom came home she decided to let us be. She went upstairs (with her boyfriend), and a little while later a man walked in through the front door (at the time no one in our town locked their doors) and went upstairs and into my mom's room.
She woke up and saw him standing at the end of her bed. She was so lucky her boyfriend was staying there! He chased the man out, and my mom hurried downstairs to get me and my sister (and was totally freaked because he had walked right by us when he came in), and she brought us upstairs to call the cops. She looked out her bedroom window and could see the guy standing outside across the street, staring up at her through the window!