"Once my own strength came in handy on the neurological wards. We were testing visual fields in a patient unlucky enough to have developed a coccidiomyces meningitis and some hydrocephalus. While we were testing him, his eyes suddenly rolled up in his head and he started to collapse. He was "coning"; this is the rather mild term used for a terrifying event in which, with excessive pressure on the head, the cerebellar tonsils and brain stem get pushed through the foramen magnum at the base of the skull. Coning can be fatal within seconds, and with the speed of reflex I grabbed out patient and held him upside down; his cerebellar tonsils and brain stem went back into the skull, and I felt I had snatched him from the very jaws of death."
Oliver Sacks, On The Move21:00 - 22:00