Given the usual vainglorious soup of mythical names, claims, swains and dames, I think the one film to recommend remains... Monty Python and the Holy Grail.
“I mean, if I went 'round saying I was an emperor, just because some moistened bint had lobbed a scimitar at me, they'd put me away!”
it is painful to see Monty Python anti-story of comic relief drawn up to stand alone without understanding.. the psychological and historical themes in Aurthur speak to worlds that are gone today. Comic relief specifically mocks and deflates many important aspects of the myth. By saying "oh that is the ONE for me" it basically flushes a lot of content into ludicrous, and yes funny, cheap theater.
I loved The Sword in The Stone as a child, and should probably re-read it someday. However, I found the later books were nowhere near as interesting, with characters going into long monologues that were just White propounding his own theories through his characters mouths.
“I mean, if I went 'round saying I was an emperor, just because some moistened bint had lobbed a scimitar at me, they'd put me away!”
https://www.imdb.com/title/tt0071853/
https://en.wikipedia.org/wiki/Monty_Python_and_the_Holy_Grai...