My friend and I saw this cheesy horror movie in the late 80's. These Teenagers/college age people go to a house to party. I'm not sure if they did any occult things or not, but there was one girl who became Possessed by a demon. She was on top of a guy and she said, "Why are you staring at me? Stop staring at me," in a kind of sexual play tone. She through her head back, and when she looked at the guy again, her face had that possessed-by-a-demon look to it and she screamed in that demonic voice, "Stop staring at me!" I think she had a black forked tongue and killed the guy with it (not sure about this). I also think at one point, either she or another girl shoves a tube of lipstick through her nipple into her chest. This was a real Oscar winner, top of the line, less than B-rated movie, but my friend and I both thought of this movie this past week. I think the title had "Witch' or "Demon" in it.

Yeah, that's Night of the Demons from 1988, starring scream queen Linnea Quigley. The lipstick scene is the one that folks remember from this cinematic opus. There was at least one sequel... and the lipstick makes a return appearance.

That's the one. Thanks!