One of my first ghost experiences, I was a kid. Probably around 11 or 12 years old.
It was night, my parents had a couple of friends over and everyone was in the living room. I managed to escape from the crowd (as I do prefer to be alone at times), and I went to my room.
The curtain was open as usually I left it open , and I stood in my room , leaned against the desk, and just looked straight at the reflection of my bedroom in the window.
(The light was on in the room, so , the window reflected as clear as a mirror would, you know? Since it was night and dark outside, and the curtain open, my bedroom window reflected everything in the room as clear as a mirror would.)
Anyhow , I was bored and just leaning on the desk and staring at the reflection of me in my room at night.
Then I saw in the reflection, in the hallway, a man with dark hair, and a dark suit . (Not at all like anyone that was in the house).
He drifted into my room, through the doorway from the hall ! Then, he came to the right of me, stopped as though standing next to me, ( I was completely stunned and in shock , which is why I didn't move).
I looked beside me , saw no one there, looked back at the reflection . He was Still there!
Then, he did something which freaked me right out, as I continued to look at him in the reflection of the window, his head turned in the direction where I was (which was right next to him, he was on my right side).
At that point, I got so scared that I ran out of the room and to the kitchen , pulled my brother aside into the kitchen (so that I wouldn't interupt my parents talking with their friend's, cause I didn't want to get in trouble, and doubted anyone would believe me).
I told my brother to come with me to our room. When we got there, the man in the dark suit, was gone. I then told my brother what happened.
I have seen other things since then, yet that was basically one of the first experiences I had.