Dwain Esper made some weird movies in the 1930s featuring random inserted footage of things like cats and dogs fighting, for example... .
Maniac is the tale of a vaudevillian serving as an assistant to a doctor who is attempting to raise the dead. He succeeds in raising one dead person with the help of the assistant impersonating the coroner, but the doctor demands "a victim with a shattered heart". Fighting cats and dogs scare the assistant away from the morgue, so the doctor declares "Coward! You have failed me in the greatest moment of my life! Wuhahahaha!", and pulls a gun out of a drawer. Offering the gun, he says "I get it. You work with me you have faith in me. Take this, take it and take your life and I will give it back to you. This beating heart will beat in your body and just think of it you will live! Muhahahah! Live! Muhahahahaha! Live!"
With that the assistant shoots the doctor. "Murder. How horrible. And of my benefactor". He soon discovers that the doctor would be missed and he never would, so he disguises himself and impersonates the doctor. But, oh no, a patient has arrived, believing himself to be "the ourang-outan murderer from Poe's Murder in the Rue Morgue". He stumbles about not knowing what to do so he reaches for the doctor's sachel and finds "Super-adrenaline.... I can't use that. I know... water... That will do no harm and I'll be rid of them". He mixes up the two syringes and injects the patient with superadrenaline. Famously, the patient declares...
"Stealing through my body, creeping through my veins, spilling in my blood, Oh, darts of fire in my brain! Agony! I can't stand this torture! This torment! I can't stand it, I won't I won't!"... He then grabs the revived corpse and takes it away...
We later learn that their pet cat is called Satan. We learn that the neighbour raises cats and rats for fur... "The cats eat the rats, the rats eat the cats, and I get the skins". At one point he claims that the cat Satan has "the gleam" and so he pops out his eye, and observes that "It's not unlike an oyster... or a grape!" and swallows it...
Ah, but there's so much more... including a catfight with hypodermic needles. If you want I can post the links to the Internet Archive from where you can watch Maniac or another Esper picture, Marihuana.