Rapex is the name of a “condom” that in many ways brings to life the myth of the vagina dentata, a toothed vagina. Patented in South Africa, the device is essentially a plastic and latex cylinder with barbs lining the inside that is supposedly only removable with the help of a medical professional. Worn for no longer than 24 hours, disposable, and intended to go for a price not much more than that of condoms, this is one of the most interesting, disturbing, and potentially misused inventions I can think of. The official Rapex website can be found here.