The Godfather is too boring? It's a movie filled with people being killed in a multitude of interesting ways. I'm curious as to what's boring about it?
As for my list:
Star Wars
The Empire Strikes Back
Return of the Jedi (all theatrical versions, no A New Hope, any of the original sound mixes)
Back to the Future
Star Trek II
Citizen Kane
Eh, more later when I can think of some.