I’ve heard that if your IQ is too high the Police won’t hire you. They claim its because you become bored to easily.
That rings true and is probably applicable to other jobs. Strangely enough, I have read that it applies to airline pilots. That sounds counter-intuitive since they obviously have some complex tasks to perform. OTOH, they are subject to just "riding along" for long periods of time as the plane flies itself, which could be monotonous.