Jeepers Creepers. I use to have recurring nightmares about him and would always visualize him flying/running beside the car/in a cornfield and literally felt stalked by him for like 2 years after I watched it. I'm still petrified of him and get goosebumps when I even think about it. Honestly, watching that movie was one of the worst decisions of my life. I'm scarred for life.
The Jackal in 13 Ghosts scared me too. I actually had a nightmare that he was chasing me and I woke up in cold sweats and my asthma was completely outta control.
I'm typically not scared by movies while watching them, it's the aftermath that gets to me. I'll start thinking about what happened and start visualizing what it would be like if it was inrl. I
still think of the witch from Darkness Falls every time I see a shadow move in my room.