Classic Howard Hawks screwball, with Cary Grant and Katherine Hepburn in 1938. I didn't really get into it, apart from the odd one-liner. The monomania of Hepburn's Susan outdoes the dishiness of Cary's zoologist David in their hunt for the leopard, the dog, and the intercostal clavicle bone of a brontosaurus. Grant was much better in later pictures.