Strictly Ballroom. Don't know how many times I have watched it. Sometimes I have just come across it part way through and can't help watching it again! We even use the catchphrase "It's not strictly Ballroom!“ - done in a Barry Fife voice of course!
The weird thing is the song Love is in the Air played at the end. I hated it when it was originally released, but after watching Strictly Ballroom, it became one of my favourite songs because it invokes the same feel good mood as the film.
Other films are Dirty Dancing and Seven Brides for Seven Brothers. Sensing a theme here! 