This happened to me when I was 10 years old and living in Texas.
It was a Friday afternoon and my brother and I were home alone. He had been in his room listening to the radio and I had been in the kitchen eating dinner about to go to a soccer game, when out of nowhere I felt a rush go right down my bones. I knew I was being watched, and this feeling was very chilling. I turned around very fast to see if anything was behind me but there was nothing. I went back to eating my dinner. About five minutes after this I was reading a magazine and a big, big thump had hit the wall not very far from me. This noise was like somebody had kicked the wall as hard as they could. I went to my brothers room and just screamed at him, but my brother sad that he had just been listening to the radio and was he was laying on his bed, so there was no possible way he could have heard it or done it. He then got up to see if I was telling the truth and when we walked into the living room where the big kick in the wall happened we had glanced over to the fireplace where a line of holiday cards were sitting and one of them started to move towards us and then just lifted up and was thrown right towards us. The window was not open and the fan was not on, we were so scared we went outside and waited for my mom to pick us up.
A couple of days later I was in bed and had just woken up to see what time it was. When I walked out of my bedroom I noticed something out of the corner of my eye. I turned to look at it and saw that it was a little boy, very white and foggy. I got closer to it and he was looking me right in the eye. The little boy was swinging in the doorway of the bathroom and had the biggest smile on his face. I was in such a trance that I forgot what I was doing in the hallway but for some reason my body just walked me into my brothers room, I looked at the clock and walked back into my room, not looking to see if the boy was still there. I then snapped out of it and grabbed my pillow and blanket and ran into my parents bedroom to sleep.
The rest of the night there were knocks in the walls all around me. I am now a true believer and read much about ghosts. I believe that ghosts communicate with children more because they are easy to talk to and kids open up more to believing what they see.