Here's a compilation of horror movie deaths. Notice a common strain through all of them? They all employ a high-pitched shrieking, scraping sound at the "money shot" to help raise our hackles. We associate such sounds with high tension, high suspense. Basically, high stress. It's no wonder we have trouble getting used to the new sound in our heads. Actually, if you go back to the shower scene in Psycho, that's basically pulsatile tinnitus during the stabbing.
