I'm sorry, I've never played any horror game, so I can only answer with a horror movie :
1 Texas Chainsaw :this one totally traumatized me, I did not even watch it, just listened from another room, still a trauma
2 Freddy Krueger , either the 1991 or the 1994 one, when he uses -I won't tell you what- as strings to play a real life puppet on a string . Same things, I had nightmares for a long time.
3 Probably Cannibal Holocaust. Almost turned me into a vegetarian.
TOP THREE THINGS YOU DID WHEN YOU HAD A CRUSH ON A NEIGHBOUR, CLASSMATE OR A COLLEAGUE