If you mean what is the movie I liked in theatre and hated watching later on TV/DVD/VHS, I'd say Star Wars.
(Sorry to say that, I know there are millions of fans out there, but that's just how I feel.)
Isn't that funny how some things were just made for the big screen ?
I always watch them in widescreen format at home too. I really wish the movie experience wasn't so darn expensive these days.....