For me it is "Mr. Smith Goes to Washington." I love Jimmy Stewart, but that ending stunk! I did it, it was me........the end.
Oh dear God I hate that movie.
Jefferson Smith isn't a human being, he's a lifeless construct, a placard upon which the filmmaker projects his simplistic message.
Capra has always had the subtlety of a brick, but "Mr Smith..." is the most pedantic, patronizing specimen of his "Preachin' to the Proletariat" series (along with "It's a Wonderful Life" and "State of the Union")