There is a scene in the French movie House of Pleasures wherein one of the courtesans gets her face cut from the corner of her mouth to her cheekbone, on both sides, like the Joker. Her John is playing with the knife inside her teeth, while she is tied up, and abruptly he rips it open.
To my surprise and shock (because I really hadn’t wanted to see the actual act) we see the whole thing on screen, the knife cutting through, the flaps of skin separating, the blood welling up, and her screaming.
My question is, how do they do this? Prosthetics? CGI? Some other way? It looked so freakin real.