Wile E Coyote

As to why Wile E. Coyote never catches the Road Runner, Chuck Jones (creator of the pair) laid out these rules for all Road Runner cartoons:

1. The coyote never catches the road runner;
2. The road runner never actively interferes with the coyote's plans;
3. The road runner must stick to the road;
4. Whenever possible, gravity is the coyote's biggest enemy.

Read more about them in the book Chuck Amuck: The Life and Times of an Animated Cartoonist by Chuck Jones (1994).

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