Harry Potter, the whole series (8 movies).
Honestly, I was very skeptical about that series, thinking it was just for kids, but it's anything but "just for kids" and it's a damn good movie series. If you haven't seen them for whatever reason make sure you do so.
I have seen the 1st one start to finish. Then after that I have seen parts of a couple others. I haven't seen any of the last 2 though. Good suggestion. Didn't think about Potter.