roooad film...
Psh. I would have to say It Happened One Night. I grew up on early screwball comedy (see also:bringing up baby, arsenic and old lace, philadelphia story, aka every cary grant comedy ever) and this is one of the best. It stars Clark Gable and Claudette Colbert. He's a newspaper reporter, she's a run-away rich girl, hilarity (and romance) ensues. It's actually a really good example of gender roles in the thirties. The female characters in movies from that period are often more capable than one might imagine in older films because before WWII they weren't viewed as a threat in the masculine workforce and there wasn't as large of a backlash against traditional gender roles. These women were even known to get a divorce on occasion. Shocking, I know. I digress. So anyway...this is my favorite scene from the movie.
I'm pretty sure that's where bugs bunny got his carrot eating banter from, but I've never looked it up.