I remember nothing about this movies except for one graphic scene. Based on the effects, I’d guess early 80’s but I could be wrong. The pivotal scene has a woman gagged with duct tape and a man wearing a Hawaiian shirt (mainly blue) behind her with a knife. He grabs her hair and from the back he cuts off the scalp and continues pulling the hair over her head and down, eventually exposing the bloody face with no skin, a tongue sticking out slightly in the middle of the mouth,and two eyeballs. I thought it would be an easy enough scene to identify, but I haven’t found it out there on and clip sites yet. Thanks.