Okay, so this happened to me last night at my friends house. So me, my friend Conrad, and Byron were home alone at 11 PM and we were sitting in Conrad's room watching some movies. And as we were sitting on the the bed, we heard someone banging at the window in Conrad's room, then it sounded like the person outside ran and started banging the door. We were terrified because we were home alone, Conrad's brother, sister, and mom were all at work. We shut the curtains, and went around and locked all the doors. And we heard the window banging every 30 minutes. In the morning, we all went outside to check out the window, and the windows screen was torn, and a piece of the window was on the ground.
Another creepy thing happened but I don't think it's related to the window thing. So all 3 of us were in Conrad's room, and me and Byron pissed Conrad off, so he left the room with a blue blanket. We thought he would come back, but he never did. So me and Byron went looking for him. We went down to the basement and in the back we saw a mattress and it looked like someone was under a black blanket. But the weird thing was, that Conrad's stair are really creaky, so you would hear him go down, but we never heard any creaking. So we were a little freaked out. So we went back to Conrad's room and watched a movie. About 30 minutes later, I said to Byron " I think we should check on Conrad. " So we went back downstairs to the basement and we looked on the mattress and the blanket was gone. Who ever was on the mattress is gone. And we never heard anyone go up or down the stairs. So me and Byron ran up the stairs to find Conrad, and we found him asleep in the living room on the couch with the blue blanket. And just remember, we were home alone.