In Black Friday, Stanley Ridges delivers one of the most incredible performances I have even seen commited to celluloid.As the meek University professor who unknowing receives part of a dead gangster's brain, Ridges is amazing.When the gangsters personality surfaces, Ridge's speech and mannerisms are transformed.He is convincing as a brutal, homicidal gangster and seems like a different actor.He steals the film easily from Lugosi and Karloff (No simple task!) and leaves you spellbound throughout.This one is worth the rental!