First one came to my mind was, "It's a Mad, Mad, Mad, Mad World." One of those incredibly long movies that seemed to pop up on commercial tv every once in a while and it seemed I never caught the first 15 minutes or so, but since it was so long, and star-studded, it didn't seem to matter. Of course I remember a time before you could just go to your local video store and rent a VHS movie, so there's that.
I also begged and begged my parents to see "Bonny and Clyde" when it came out. I finally got to see it a couple months after it came out at the local drive-in.
Mostly if we did get to see a movie at the theater it was Dean Jones and/or Flubber, or possibly Don Knotts wishing he was a fish.