Oscar Winning Movies

I have been watching a number of Oscar winnings movies recently and it seems a very long time since I enjoyed an Oscar winning movie. It's been at least 15 years. What's your favourite Oscar winning movie? Remember it must have won Best Picture at the Oscars.

Here's my thoughts on each decade (I haven't seen all of them):

30s
Favourite: It Happened One Night
Worst: You can't take it with you

40s
Favourite: Casablanca
Worst: How Green was my Valley/Gentleman's Agreement

50s
Favourite: On the Waterfront
Worst: The Greatest Show on Earth

60s
Favourite: The Sound of Music
Worst: Tom Jones (This one I feel is the worst of the lot)

70s
Favourite: The Godfather Part 2 (Too hard to choose, I think there were 5 or 6 ATG movies winning Oscars this decade)
Worst: Patton

80s
Favourite: Rain Man
Worst: Chariots of Fire

90s
Favourite: Braveheart (another tough one)
Worst: Shakespeare in Love

2000s
Favourite: A Beautiful Mind
Worst: Chicago

2010s
Favourite: Birdman
Worst: Argo/Moonlight (many options here)

2020s
Favourite: Everything Everywhere All at Once (best of a bad bunch)
Worst: Nomadland

Favourite overall: The Godfather Part 2