When I first watched
Cars, I was put off by the world in which these livings cars existed and thrived. Are there no humans? How did these sentient-car-beings build things without opposable thumbs? Are they semi-organic in nature? How do their brains work? They can become aroused, but can they breed? How? Is there a car god? What does 'death' mean in this car world? What happens when fossil fuels are depleted? Are there hybrid models? Are those hybrid models discriminated upon? What do they do with their money? If the world is populated by plant-life/flora/fauna, there must be others, right? Animals? So aside from the cow-tractors, are there other animal-cars? There are many other questions, but I'll stop there.
I know there are many many animated films in which anthropomorphized animals, machines, etc etc behave in unrealistic fashions that I probably shouldn't think too hard about, but it's only when watching
Cars that I can't help but keep asking. Most of these other animated films at least have humans to offset the weirdness. Like, the talking animals behave like humans, but obviously humans can't understand them -- thusly the rules of its universe is established.
Cars never establishes the rules of its world.