I had an old friend who duck hunted the Mississippi for over 35 years. A pretty agreeable guy most of the time and an ethical hunter all the time, it just used to frost him when hunters in other nearby blinds would sky-bust at ducks... shoot at them out of range, assuring none of the other blinds got an ethical shot at them.
Well, you just have to be downrange of an incoming cut-shell and hear the sound they make as they pass-by overhead, and well you'll never forget that sound. You might not sky-bust anymore either; for sure, not when the 'ol man in out.