I have seen some bad movies in my life and this is most definitely one of them. Screenwriter Hildegarde Stadie, who is credited as a writer for 5 films, should have had her typewriter taken away from her permanently after her first effort. Maniac was third on the list which goes to show you that practice does not necessarily make perfect.
Maniac includes murder, insanity, nudity and the eating of a cat's eyeball. Seriously! Every scene is prefaced with scientific and/or criminal definitions of various forms of insanity with the hope that posting such things would add a sense of credibility to the film. Yeah, right! A plot summary for Maniac is unnecessary and nearly impossible. Suffice it to say it's one red hot mess. Maniac is listed among The 100 Most Amusingly Bad Movies Ever Made in Golden Raspberry Award founder John Wilson's book The Official Razzie Movie Guide. I couldn't agree with him more.
If you want to see 1930's horror at its best, stick with Frankenstein (1931) or Freaks (1932) and don't waste a single brain cell on this dreadful movie. [Unless you have a passion for really bad cinema!]
For more info check out the film's entry in IMDB.