What this young Indian man was exhibiting was a remarkable and extremely rare case of craniopagus parasiticus—so rare, in fact, that fewer than a dozen such cases have ever been recorded.Parasitic twinning is just one of many possible outcomes on the multiple-birth spectrum.
It's these unsung twins—the disarticulated, malformed, gelatinous or barnacle-like human beings—that are the real marvels of the multiple-birth world. (Actually, as we'll see, while they're certainly human, there's usually not much being to them at all.)