Tragicomedy
I'm rewatching my favorite film now and just realized that most of the film is a comedy. Yes, there is Little Ratbags with his wisecracks, but the rest of them are unintentionally funny throughout the whole film. Originally I watched it as a tragedy, but with a (spoiler) happy ending. So when Richard Attenborough has that scene where he laughs and turns into crying, it sums up the whole film!
https://www.youtube.com/watch?v=kr9de4C3wco&t=3898s