Share 'Herbs in the Dark'

Ok so we can look at Cunningham, we can look at Beryl, we can look at a LOT of herb books and we find positive wonderful bright uses for herbs.  Can we come up with a list of herbs and their darker uses? I would request references namely is it from personal experience, logical assumption, or a book.  If its a book please give author and title, if its assumption please explain if its personal expe…