Just as the title says. Greatest is subjective. Most influential, favorite, funniest, whatever. Try to explain a little as to why it made your list, too. I'll go first.
In no particular order:
1-Big Fish: I think all of us have our "uncatchable fish", and this is a fantastic movie. My grandfather also loves to tell stories, and his health is back and forth at the moment. It's a 64 Chevelle Malibu SS, not a Charger, for him though.
2-Toy Story: Embedded in my subconscious. My mom actually loves this movie more than I do and it's so intertwined with memories of my childhood I can't help but put it here.
3-Finding Nemo: This is the first movie that sold me on Pixar. I still don't miss anything Pixar comes up with because of this movie when I was a kid.
4-Star Wars: I don't know what I can say about this one. Another movie
5-On Any Sunday: This movie was a watershed moment for me. It's quite a bit older than I am, but it doesn't matter. Before the days when you could find anything online, I heard my dad talk about this movie and how much he loved it, and it was only a couple of years ago that I finally found him a copy and got to see it myself. It made the same impression on me.
6-Fear and Loathing in Las Vegas: I watched this movie before I read the book, and it spoke to me at the time. I was not in college, not employed, not doing anything, and I felt everything bearing down on me all at once. When I saw this for the first time, I was on an airplane to Vegas. Couldn't have been better timing.
7-For Your Eyes Only: I will never forget the ski vs. motorcycle chase. I also considered Skyfall, Die Another Day, and GoldenEye, but the chase scene clinched it for me.
8-Pulp Fiction: I just like this one. Who doesn't?
9-Harry Potter and the Philosopher's Stone: I grew up on the Harry Potter books and this movie was everything I wanted it to be.
10-Dust to Glory: Yeah, I slipped another motorcycle movie in there. This film is a masterpiece and it captures the love of speed better than anything else.