to be parking your car.
This appears to be the top half of the main trunk that split away. We had a tremendous wind storm a few days ago. Made a mess of everything. I suspect this happened then and it was evening when the wind storm hit so the park would have been closed and no cars in the parking lot. Still, it did a number on that fence, and would have been kind of cool to have seen happen
...at a safe distance away of course.