I don’t freak myself out thinking about scary movies when I’m alone anymore, that job is usually left up to my imagination, but when I was a kid I watched the movie Critters (my first rated R movie). After seeing that movie I would psych myself out anytime I was alone.
I distinctly remember thinking about how I could protect myself, but there was no way because the “Critters” could eat through walls. I eventually saw the movie again when I was a little older and realized how ridiculous it was, putting a stop to freak-outs.