An unbelievable video published by AP some time ago, where you can see a bird hitting pedestrian with beak on head.
Seems that this bird feels threatened by the people who pass there by. Maybe there is something in some people that urges the bird to hit them. Maybe the smell, the way of walking, hair style, who knows.
Enjoy this rare video and judge by yourself, and be careful when sensate birds like this over your head, don't try to see them after a while, who knows where they are going to hit.