There are few people on earth like Jon McMurray. The Georgetown, Ontario man looks pretty ordinary from the outside. He's married with two young boys and works part time at the local beer store. But looks are deceiving. Jon McMurray has a condition so rare, so bizarre, that it's difficult to even comprehend. It's called visual agnosia, sometimes referred to as face blindness. The condition was made famous by neurologist Oliver Sacks in his 1985 book, "The Man Who Mistook His Wife for a Hat." When Jon looks at people, he is unable to translate what he sees with his eyes to a memory of who that person is. Visual agnosia is a neurological disorder so rare that it affects less than one per cent of patients who've suffered a traumatic brain injury.