Jeffrey Dahmer was using the vat police found in his apartment to clean his victims’ bones to preserve them, per A&E. When Dahmer was a child, his father, Lionel Dahmer (above left), a research chemist, taught his son the proper way to clean and preserve bones as a way of trying to connect with his introverted son.

Carl Wahlstrom, a forensic psychiatrist who evaluated Jeffrey Dahmer after his capture, told A&E that bleaching the bones of rodents they found under the house was “a father-son activity” the Dahmers did together. Jeffrey Dahmer kept the bones in pails that rattled when shaken. His family referred to them as his “fiddlesticks,” per A&E. Dahmer apparently liked the way the bones fit together, per Listverse. But Dahmer soon moved on from collecting dead animals to killing live ones, dismembering them, and keeping the remains in his clubhouse, per the Independent.

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