The Unmentionables (1963)

Rocky and Mugsy are hot on the heels of "Elegant Ness"—who's really Bugs Bunny in disguise—as they tear through the ACME cereal factory. It's a full-on parody of TV's "The Untouchables," with the two gangsters scrambling after the slick, wisecracking rabbit past conveyor belts and boxes of breakfast cereal.