Researchers from Sandia National Labs and the University of New Mexico have discovered that human brain injury can occur less than a millisecond after a head is thrust into a windshield, during a car accident.
Snip from announcement: "This happens prior to any overall motion of the head following impact with the windshield and is a new concept to consider for doctors interested in traumatic brain injury (TBI)."
More infoz here: Link.
Trippy simulated car crash brainsmash videos: one, two (MPEG).