Underwood punched Bowie during a row over a girl when they were just 15, which left one pupil permanently dilated - a condition called Aniscoria.
Medics reckon Bowie was caught in the eye by George's fingernail, which left his left eye looking like it was a different colour.
But despite leaving his friend with a permanent disorder, Underwood revealed that the singer later thanked him for giving him his famed look.
He said: 'He later told me I did him a favour.'
FCBayernMunchen wrote:Came across this on my facebook feed. Love this song and the film.
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