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troperville

This rule is not a contradiction of, but is in tension with, Artistic License. But if you use the Cool Of Rule to make something so cool that the audience willing suspends their disbelief, congratulations! You're an example of the Cool Of Rule.

Examples:

In The Sixth Sense Dr Malcolm Crowe follows all the rules given for ghosts, while still (theoretically) leaving the viewer with the impression that he is a living human.
Sherlock Holmes and mysteries general often make heavy use of this rule. When they don't they frequently aren't considered as good.
Death Note is basically built around this rule, as much of the entertainment derives from Light and L's clever use of the rules of logic and (in Light's case) the rules of the Death Note.
Baby Steps: Unlike some other sports manga, not only is tennis portrayed as realistically as possible, but how the body develops and transforms over the course of training.