[nickcarraway]

Foreign Correspondent
The Big Sleep
The Thin Man
My Man Godfrey
Bringing Up Baby
You Can’t Take It With You
Sullivan’s Travels
(Almost anything by Hitchcock, Hawks, Capra, and Sturges from that period)

[ClarenceThomasfan]

Further Adventures of Ma and Pa Kettle (1949)
The Egg and I featuring Ma and Pa Kettle (1948)

[Publius]

Sullivan’s Travels

Good pick for Preston Sturges, but don't forget "Hail the Conquering Hero" from 1944 with Eddie Bracken and his inimitable double-takes. It's consistently the funniest of Sturges' films.