A local rider took offense at an illegal advertising sign placed on his residential street near his house, so he snatched it up as he rode by at the end of his morning training ride. The sign was one of those temporary ones used by politicians and other questionable enterprises, cardboard over a wire frame. The wind caught the sign and blew it into his front wheel. He crashed immediately.
The wire sign frame bent one spoke in his Shimano Dura Ace front wheel. That had to be ordered. Only later did he notice that the end of the wire had punched a hole in his carbon fiber fork.
A steel fork might have bent when the sign stopped the front wheel. An aluminum one might have bent or cracked depending on the forces involved. Anyway, it was an expensive morning for the guy.