Apart from the game glitching to INSIDE Lara's head in Angel Of Darkness (unexpected jumpscare, ugh seriously, horrifying), mine would have to be the original Silent Hill. I was about 11 when I first played it and that little courtyard area in the school, I went out there and heard but could not see the monsters. Along with the ambient track as well I just literally froze my Harry - he was standing there with his back against the wall and I wouldn't move. That stands out because I think it was so exact as to how I would probably be reacting in real life. I couldn't move!! And it was just a game.

That game got into my head for weeks. I woke up in the night realising that the sound the school generator makes when you switch it on makes the same sound as the boss who appears there later. Little touches like that which just pull the whole game together into something quite psychologically traumatising