Turn too sharp, the roll starts, uncontrollable you roll through several Z’s bounce off a wall then gasp gas pumps. Sliding to a stop just before hitting the pumps you undo you seat belt. With a bump you fall to the ground and crawl out the window.
Or
Turn too sharp, the roll starts, you bounce around inside the vehicle because you don’t have a seat belt on. Maybe you even get flung out the window. Then road rash gets added.