Edward Mordrake was believed to have an extra face that could laugh and cry--he committed suicide at the age of 23.
Overview
Craniofacial Duplication is extremely rare and is form of conjoined twinning that occurs in about 0.4 percent of all conjoined twin cases. In all cases a single head with two cranial structures are attached to one body. The first case (discovered in literature) was found in 1884 and since then, there have been 35 cases known world wide.
Craniofacial Duplication of a girl at 2 and 1/2 weeks old from India
Craniofacial duplication is formed during the 2nd week of pregnancy which is a result of the embryo not spitting into two separate twins.