Ever heard of ABBA? Even if you haven't, this is probably the best feelgood movie of them all. It's a musical that strings together a storyline from many famous ABBA songs. With huge names in the cast, including main characters Meyrl Streep, Amanda Seyfried, Colin Firth and Pierce Brosnan to name a few. Their energy in the movie is infectious, and you can just tell that they had an absolute blast making the film, which makes you want to get up and sing and dance for the duration of the film. Not to mention, the second one has just come out, and is just as brilliant!