There are a few..

Robot-Jox: This was quite possibly one of the worst movies to come out of the 80's.. but it became the bad-movie standard we measured all other bad-movies against. "It was better than Robot-Jox" wasn't exactly a glowing review.

ET: My mom and aunt took me and my brother to see this when we were little.. apparently, we all cried.

Star Wars: Mom and Dad took us to the drive-in to see this amazing flick.. sadly, I was only like 6 yrs old and didn't make it through the entire movie without falling asleep. If they only knew..

Footloose: My brother and I went to the theater to see Enter the Dragon, and somehow ended up in the wrong theater. I wanted to leave, my brother wanted to stay. I didn't get to see Enter the Dragon until years later.

Star Wars Episode II: The Clone Wars: I was changing jobs and moving back to my hometown, two of my buddies had driven from Florida to Charlotte, NC to help me move. We went and saw this the night before I moved, and one of my buddies spent the next day (all 9 hours of the drive), periodically talking about Natalie Portman's breasts.

Lord of the Rings trilogy: Saw all three of these with my girlfriend, who ended up being my bride. Enough said.

The Star Wars saga: Turns out, my wife is a bigger Star Wars fan than I am.. and that's no small feat.

There are others, but i'm already over my time limit here..