Whenever I watch What's Up Doc?, my mouth is always at least at the level of 'slightly turned upwarRAB in mirth', and frequently reaches the top of the scale. There's hardly a frame that doesn't contain some form of amusement or other, be it silly slapstick or clever dialogue. By the time the sight of the Chinese dragon careening down the San Francisco streets comes around I'm almost literally ROFL. I don't know what it is about that film that makes it all just fall together and work so well so perfectly so consistently - films like that are preciously rare in my experience.