...what about you?
Some things that madame Delphine LaLaurie did to her victims, some of which prayed to be killed when rescuers found them -- their bodies were too badly distorted and mutilated.
Body farms, especially that created by William M. Bass -- maybe there are others too, but I don't know about them.
Certain sights that evoke my trypophobia. Trypophobia is "an aversion to the sight of irregular patterns or clusters of small holes or bumps".