Or rather, movies I'm glad I gave a second chance.
One was Chariots of Fire. My first memory of it predates my tenth birthday, and recalled it as endless footage of indistinguishable characters running along the beach. Borrrrring. (A cursory survey of others raised similarly suggests this is a common memory. Just because a movie is virtuous and lacking in objectionable material does not mean it will be of interest to young children.)
When I watched it again in my late teens, I was astounded. It had characters! Plot! It had Gilbert and Sullivan! Quite enjoyable.
Sometime in those years, though, I watched The Philadelphia Story and was not at all impressed. It was far too full of "innundo" (as Dinah would say) for my tender ears. I couldn't make out what the point was at all, at all. It wasn't even that funny and it seemed to be justifying quite inappropriate behavior.
Recently, however, DOB saw a clip of it and was dying to find out what was going on. So I agreed to give it a second chance. And behold it was funny, after all. And there was a point, and an excellent one, not about justifying inappropriate behavior, but about extending grace and unconditional love to each other. So, I'm glad I gave it a second chance, too.