This is hard but here are the movies that came to mind first (no order after the first)
1) King Kong - I took my brother to see it for his birthday, I probably enjoyed it more, this is my favorite movie ever. People say its overrated or didn't meet expectations, but honestly this was the perfect movie for me. I went through every emotion watching this movie. And yes at the end I cried like a little baby and didn't leave the theater for about 15 minutes, it was such a great movie for me.
2) Kung Fu Hustle - This is like King Kong to an extent, it had all the things I ever wanted in a movie, the fights were great, the emotion was there, and it had some comedic moments. Everyone needs to see it, its such an underrated movie.
3) Sin City - The first R rated movie I saw by myself legally, and what a great one to see. Once again it had everything I ever wanted in a movie, the stories really made this movie for me.
4) Black Hawk Down - First movie I saw in surround sound at home, it was a great action movie and being based on a true story made it whole lot better. I haven't seen it in a while so I should go watch it again.
5) Pokemon: the First Movie/Transformers/King Kong vs Godzilla/Blues Brothers/Terminator 2 - Movies I watched when I was younger, I couldn't pick one out of the bunch but I really loved these movies and watched and enjoyed them alot when I was a kid, I could probably throw a few more in here but these are what came to mind.