Depending on your age and what you're exposed to, there has to be a movie that absolutely scares the piss out of you. Mine would have to be Pet Cemetery. I saw it when I was young and it's stuck with me ever since.
I agree with Paba16 when i was around seven i saw a Freddy marathon i was scared went to bed and i had this book shelve in my room and my blinds were on it i looked up and it looked like Freddy's hat i screamed for my mom she still makes fun about me for today
sorry for double posting bu i remembered another scary movie its called shadow puppets
this group of people wake up in an underground asylum with no memory the place is deserted and theres this thing that is made of shadows killing them all one by one so creepy i slept with my light on for a week