This is a horror movie that I can't remember the title of. All I can remember is that the action happens in a castle or mansion. The people of this place get seemingly drunk on blood for some reason. There is this one scene where the guests that are visiting the castle/mansion are trapped in a cellar.
A bald man, a young woman and a young man are there. The bald man gets dragged behind a white curtain and all you can see is blood on the curtain and hear screaming from one of the men. The killer uses a knife. The killer then feeds blood to the young woman which makes her faint. The killer cuts the bald man up so he can have his blood, and I'm not sure what happened next.
It's from between 1960 and 1990.