This deformed skull from a child was found in Mexico around 1930, in a mining tunnel. According to a paranormalist, it’s the skull of an alien. Doctors disagree, however, claiming it to be the skull of a child with hydrocephalus, where the skull becomes enlarged due to swelling. However, the capacity of this skull was far more than what the skull of a child of that age should be, and with no signs of swelling, suggesting that it’s an abnormally large brain cavity.

Others, suggest it might be the result of human and alien breeding, much like the whole plot of the X-Files.