3. A movie that makes you really happy
Honestly, this is a big category of films altogether, but when I thought about this and glanced at my DVD collection, the DVD case for Aaja Naachle just kind of jumped out at me. It's perfect feel-good entertainment, though not precisely the kind that's carrying a particularly thoughtful message. I think it exemplifies a genre of film where everybody ends up happy - those who you root for to get together, get together, the heroes emerge victorious, the villain learns a lesson and stops being such a big meanie. Yes, it's candy-fluff but sometimes, that's really all you require out of a film.
Bonus: vibrant older female lead, fun songs, great ensemble cast. Aaja Naachle just kind of has it all.