Cosenus' pet is based of a character from a german childrens book. A book from my childhood, I'm pretty sure everyone, from my generation (in Germany), have read it. I'm not sure if children are reading it nowadays.
The book I'm talking about is "Struwwelpeter" made by Heinrich Hoffmann in 1845.
It's pretty hardcore, children burned to death or got their fingers cut off. Another book from my childhood wich was samiliar to that was "Max und Moritz" by Wilhelm Busch. Actually I had the entire Wilhelm Busch collection.
The story Cosenus' pet is based of is called: "Die Geschichte vom wilden Jäger" (The Story of the Wild Huntsman)
It's about a hunter who took a nap and a hare stole his glasses and weapon. The hare then started to hunt the hunter. The hunter jumped into a well, it's unknown what happened to him, presumably he died. The hare shot a coffee cup and his kid got burned by the hot coffee.
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Cosenus' pet is not a hare tough he's a rabbit. But yea... he has the glasses and the weapon.