What is the scariest movie or movie character you have ever seen? Have you ever watched a movie so scary that you had nightmares or it caused you to stay away from certain things or places?

For me, I've seen lots of them that have kept me awake at night or gave me nightmares. Children of the Corn scared me so bad when I was little that I didn't sleep, Jaws scared me to where it made me afraid of the beach for a while, Jeepers Creepers gave me nightmares for months, & Pennywise the Clown from the movie "It" scared the hell out of me as a kid & I didn't want to go near the shower drain! To this day that freakin clown gives me the creeps like no other.

So, what movies or characters scare you the most?