What are /r/truecreepy's favorite Products & Services?

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It's the cover art for a single from the band Liars. Don't know the story behind the picture, though.

https://rateyourmusic.com/release/single/liars/we-fenced-other-gardens-with-the-bones-of-our-own-1/

You should read "The Red Market." Great book that examines the sale and procurement of human products, including bones, and why it tends to be problematic.

Some of those are a little questionable. There are strong arguments that the charges against de Rais and Bathory were contrived and embellished at the instigation of their heirs or political rivals, and their confessions obtained under torture (which was considered better than a mere confession back in the day, but makes them doubtful now).

H.H. Holmes was legitimately a conman and murderer, but the "confirmation" of 27 murders is only via confessions, some of which were proven frauds (he was actively trying to sell a confessional autobiography). The reliably proven count of his murders is more like 7. The "murder house" was mostly a fraud scheme for ripping off contractors and furniture dealers, and the stories about it were heavily embroidered by the tabloid press, police departments trying to "clear their books", and again, Holmes himself (he claimed to have murdered the builder of his crematorium, who later showed up to strenuously deny that account). I recommend Adam Selzer's revisionist account of his crimes, though Harold Schechter's more traditional account is entertaining, and not too excessively sensational.