All right, I admit that "Reefer Madness" had continuity one could follow; but after you lose interest in 'counter-culture' naughtiness, that movie does get a little dull quite often.
The thing I like about "Maniac" is that it makes absolutely no sense whatsoever. Although narrative bits and pieces are borrowed from mainstream horror films of that era, and of course from the stories of Edgar Allen Poe, they're never actually woven together in any coherent manner. Nor is there any relationship established between these and the recurrent dictionary definitions of various psychoses that appear on title cards with syrupy strings playing in the background.
And of course none of it's believable in anyway - especially the make-up when the killer 'disguises' himself as the mad scientist.
However, I will say that the pacing here is swift, the dialog hilarious, the acting overwrought to the point of pure self-parody, and, after all, folks - it's only 51 minutes.
And it only cost me $2 - one just has to do one's shopping more carefully.