I have been in one during my college days. Our friend who was driving fell asleep and the car drifted off road and hit a tree. Luckily the car wasn’t at a great speed. We escaped with minor injuries.
Nothing major. I once rolled a car, wrote it off, but was moving slowly and wearing a seat belt. And there was no flange for a shoulder belt on the side wall to put out my eye when the car flipped onto its side. And the windows rolled down with a crank…so I just vaulted out the window and walked away unhurt.