Once upon a time, there were two cats, one of whom had learned to fetch in her own special sort of way. She learned that if she brought her owners a ball, they would throw it for her so that she could chase it. This she enjoyed very much. The problem was that this cat didn't pay attention to where the ball was thrown. She'd always run in the same direction and expect the ball to appear somewhere along her path, which sufficed for the times that it was thrown that way but confused when it wasn't. The other feline was content merely to watch the entire affair. He watched the ball, saw where it was thrown, looked at his companion running the wrong way, looked back at the ball, and remained where he was.
I suppose there's a lesson in there somewhere.