Opera (1987)
When soprano Betty (Cristina Marsillach) suddenly goes from understudy to leading lady, her turn as Lady Macbeth seems poised to make her a superstar. Too bad a serial killer with a personal vendetta is stalking the budding diva, murdering people in Betty’s orbit and sometimes making her watch by pinning her eyes open, which is just as excruciating as it sounds. Speaking of eyes, Opera contains one of Argento’s most shockingly memorable kill scenes, in which Betty’s agent (played by regular Argento collaborator and onetime partner Daria Nicolodi) gets shot through the peeper while peeping through a peep hole.