If you see one of these strange looking bottles the next time you’re at the beach, it’s best to keep walking. The green bottles are said to contain concoctions of hair, herbs, local plants, nails and even bodily fluids. According to KXAN-TV, the practice of witch bottles goes back hundreds of years and “have been historically associated with the supernatural and magic.” Dr. Annie Thwaite, a research project coordinator at the University of Cambridge, explained that the bottles were used “as a kind of medical treatment or healing” for those who were believed to have been cursed by a witch. Per …