When I was about 6 or so, I somehow managed to watch Aliens on the sly when it was showing real late. Something about the trailers just meant I HAD to watch this movie, for some reason. I seemed to think it was about space dragons, which in hindsight is probably not far off.
My parents eventually caught on because I became a nervous wreck for a couple days. I was afraid of being alone, or in the dark, and even having anxiety attacks thinking things could burst out of my stomach at any minute. Movie left quite an impact.
Few years later I watched it again, and actually enjoyed it. Few more years and a handful of rewatches, they're basically now my favorite things in the universe. Massive Aliens fan, *almost* every movie, yes I even enjoy most of the crappy ones too. Not to mention the games and some of the comics. Aliens itself I can quote a large portion of. I've considered getting a xenomorph tattoo (there are some seriously awesome ones out there) but at my age, I don't know if it's worth it.
Yeah I was scared of other movies too as a kid (Nightmare on Elm Street, and Chucky most of all), but after I became a fan of the horror genre, it's quite hard to be shaken by anything these days, which kinda sucks.