if you are serious here and not joshin’ us.....that is not the point, not a good idea imo. the perp high on booze or drugs most likely, has already shown he is not scared of much if he is in the process of a home invasion. there is no guarantee this fool will even recognize the sounds of a pumper being charged, why count on that as some sort of defense? why give away your location noisily racking in a round? why risk some sort of possible mis-feed or jam while racking in that first round at the moment of truth, where the use of deadly force on your part might be imminent? I have taken quite a few firearms related courses/classes over the many years, (a few taught by men all heavy duty FReeper gun guys would recognize the names of instantly), and this age old wives tale/myth is debunked everytime it has come up either in student/teacher question and answer sessions or taught in a misc. items part of the class by the instructor. (it does not even come up in the advanced classes), I respectfully disagree with your premise here MrB.
Here is the “real deal” content regarding shotgun use.