You and I share a common terror in A Nightmare on Elm Street, the original of which is still nightmare fuel even today. Other childhood scares include my introduction to the Friday the 13th series with number 7, a massive "NOPE!" moment during Prom Night III: The Last Kiss where a bitchy school office worker is doused in battery acid, and an utterly terrifying segment of Fantasy Island entitled "The Nightmare", where a woman re-lives a nightmare she's had since she was a child where her room is suddenly engulfed in flames and all the toys start screaming and flipping the hell out.
I too was a kid with an overactive imagination, and there were plenty of things that would have sent me into r/NoSleep territory, many of which aren't that scary when looked at in retrospect.
Most recent movies to get me were The Mist from 2007, and The Fourth Kind from 2009, which were both done just well enough that I still can't get some of the visuals out of my head more than ten years later.
what a great response, especially since I haven't seen many of the things you are referring to. That Fantasy Island sequence gets a big agreed from me but especially because of that damn clown in it.
I'm writing down those other films because I haven't seen all of them yet. I'll at least look up the highlights.