Shawshank redemption

Prior to watching this movie i had a feeling that i recognised it from somewhere or i had watched it before. We watched this movie as a class as not many of us had seen it and miss said it was a classic. it took me half the movie to realise that i had watched it after i asked miss to confirm what i thought happened which was right. The film itself was so good and really kept the audience interested with many different problems before the great escape.