MANIAC (1934) - Wow, found this little $1 DVD at Pathmark last week. Didn't like it at first as the actor/doctor was really bad then about a third into the film it became very entertaining. This is a rather shocking film for 1934 and they give they put on the screen in typeset info on mental disorders all through the movie.
(http://www.missinglinkclassichorror.co.uk/maniac1.jpg)