This week on Horror Thursday, we're looking at one of the odder Boris Karloff films. No, he doesn't play a literal monster or undergo some horrifying physical transformation; it's psychological horror about trying too hard to save the world. Corridors of Blood, sometimes known as the opium horror, is about a surgeon in the 1800s trying to perfect a technique to make surgery painless for the patient. Let's just say there's a very clear reason this film is in the Criterion Collection. I don't think I've ever seen a more Realist (capital R, like Dickens) film before, where life is constantly going on beyond the altruistic obsession of the doctor. Horror Thursday: Corridors of Blood