I had it happen to an old one tonner ute and it ruined the car as kingswood bonnets weigh a tonne and the thud was lets say horrific at 140kmh on a country road.

My next one tonner had a fibreglass tilt front end and apart from never possible to flip open as it opens the other way it saved about 120kg overall from the front end!

this is where Mazda classic cars are better designed with reverse opening bonnets.