I was at my step-sisters' house in Sherrell's (my oldest step-sister) room playing a game. My two real sisters, Rebekah and Samantha, were there too, and our parents were out grocery shopping. We were all kind of hungry so we decided to go into the kitchen and get some food. When Sherrell left the room and turned off the light, I decided to try to scare Samantha (I sometimes like to reach my arms out and moan like a zombie). I started acting like a zombie when I felt something touching my shoulders. Someone was reaching around my neck! I immediately ran out of the room, thinking it was Sherrell.
But when I got into the kitchen, everyone else was already there. Sherrell was putting a chicken leg into the microwave, which indicated she had been in there too long to have done it. Everyone else was too small to reach my neck anyway, so it couldn't have been them. So I guessed it was a ghost that did it.
Later on, we went back to my house. It was bed-time and I wasn't tired, so I snuck into Sherrell's bed-room. I saw her taking out her phone battery (she said it was dead) as I walked in. We started talking and I got tired and decided to go to bed. When I was about to leave, her cell-phone started ringing. She flipped the phone open, not remembering she had removed the dead battery. It instantly died when she opened it. She came into my room and we locked ourselves in. We stayed there for a while, then the door flung open. But nobody was there. We were both pretty scared, but after a while she decided to go back to her bed-room and go to sleep.
The ghost (or whatever it was) stopped bothering us after that.