Close Encounters of the Third Kind blew my mind when I was a kid. I didn't understand much of the deeper stuff until I got older but even at my young age I was captivated and knew that this was the kind of movie that doesn't come around often.
Reservoir Dogs shattered my perception of how films were made. Never before had I seen a movie where not only was it told out of order but that it made perfect sense. Plus, that it was so visceral and the dialog wasn't just filler. It was hilarious and brutal, often at the same time.
Starship Troopers...is just...friggin incredible. I don't think I can even put words into how much I love this movie. I seriously came close to getting a Mobile Infantry tattoo but then realized it would look stupid on my non muscular arms.
Alien taught me the value of atmosphere over "boo" scares.
Akira made me realize that animation wasn't always for children.
Tarzan the Ape Man was a crappy movie but it was the first time I saw boobs in a movie and that was pretty awesome.
Audition reminded me that every time I think I've seen it all Takashi Miike makes another movie.
Eddie wrote:Lastly, and I can't believe I'm saying this, but Clerks.
I'm with you in this one. While all these films changed my perceptions of cinema, Clerks literally changed my life. I saw this guy (Kevin Smith) who got up off his ass and made one of the funniest movies I ever saw in a way that was unlike anything I had seen prior. It made me attempt the same. While I never got beyond making crap horror shorts in backyards with friends, it still cemented my love for movies beyond just passive entertainment. It made me want to get involved.