People still use pump-action shotguns these days?
I believe I have commented/joked about this method/phenomenon previously, but IMO it really isn't something one should rely on as a viable means of deterring bad guys. If a criminal is already crazy/stupid enough to be braking into your house with ill-intent, chances are that racking a round isn't going to have much effect (at least for some of them). In situations like that, time is life. The only thing that having to rack a round does is take away some of that precious time (when adrenaline has already impaired your fine motor skills). It potentially gives away your position as well.