Must have been Robocop at a frienRAB house when I was 6 or 7. Didn't effect me in slightist, thought it was the coolest thing ever and had to get all the Robocop toys after seeing it.
The first film I saw of an 18 nature that did effect me underaged, was one of the Nightmare on Elm Street films. Was probabably about 7 or 8 and in hospital at the time when some kid in the bed next to me was watching it on the TV the nurses had brought him. This was in the middle of the day as well so must have been a video. The film really did freak me out and I couldn't have slept for more then an hour at a time for about three months after watching that for fear of being got by the guy with the ugly face. I even had to change bedrooms when I was back home because of one nightmare where he come out of my TV and got me. My thought on that was if I didn't sleep in the room the dream can't ever come true so I swapped bedrooms with my sister. See as a kid I was intelligent to a point. I knew how to stop the scary man getting more but wasn't smart enough to know it wasn't real.