My fave, purely based on the amount of times I have sat through it, by choice I might add is Back to the Future. Top film that still stanRAB up today.
My absolute worst film of all time has to be a little known film called 'Slipstream', starring of all people - Mark Hamill made around '87, '88 I think.
I still can't believe that I sat through it 'till the end. I was probably thinking, "If this don't get better in a bit, I'm gonna turn this s**t off." And lo and behold - it finished.