Run over by a truck. 19 broken bones, punctured lung and concussion were the major immediate injuries. It actually did not hurt at first, not even the first hour or 2 while the first responders were opening the car with the Jaws of Life. I passed out from lack of oxygen during extraction, thankfully.
But the morphine dose was not correct, or I did not process it normally, and I overdosed and went into respiratory arrest. The pain was so severe my son in law told me he could hear me screaming when he got off the elevator. They put me in a medically induced coma for several days.
I was on 3 dif pain meds for 6 months, and the first 4 months were Hell, pure Hell. Never ending pain, only dulled.