Watching Mon Oncle changed the way I looked at the world. Concentrating on behaviour rather than conversation is the gift which Tati gives us. The world is wonderfully ludicrous.
His films are long and basically nothing is happening, yet it's the finest kind of entertainment bordering with education that improves the skill of perception and appreciation. I've watched some of his films maybe 5 times and I don't see why not to watch them even every month.