Ben Stacy: Great-great-great-great-grandson of Martin Fugate and 'Blue People of Troublesome Creek'

It wasn’t just Ben Stacy’s astonishing arrival in 1975 as a baby with blue skin that shocked doctors.

The 37-year-old descended from an extraordinary family in Kentucky - and although the colour soon diminished from him, his lips and fingernails still went blue when he became cold or angry as a child.

He came from an isolated family whose members were born with a condition that discoloured them, as a result of a coincidental meeting of recessive genes, intermarriage and inbreeding in the 1800s.