Star Wars: The Empire Strikes Back.<br />
Movie that most beat my expectations coming into it: Batman Begins, because (a) I'd seen Batman Forever and Batman and Robin and those were both awful and I was expecting more of the same (I didn't know about the Batman movie reboot yet), and (b) I first saw it as an in-flight movie.
OMB that's a tough one...breakfast club or Atlantis or Lilo and stitch or lion king
Lone Survivor. I nearly cried at the end.