When I was a kid, maybe 8 years old or so, my grandfather had the meanest variety of birds imagineable:  Mean turkeys, terrorizing geese, and an aggressive rooster (no idea of breed as it was 30 years or so ago.  Some sort of red feathery thing).  The rooster would terrorize whoever collected eggs and one day it went after my older brother (who was maybe 14 or so).  My brother sees it charging and punts it away, but subsequently slips in mud (or cow patties, or whatever) and pops up noticing the rooster was 'gone.'  Just as he asks "where is it?!?!"  The rooster lands on his head and delivers a peck, center mast of his skull, and follows it up with a few more...
 
Next I see my brother, is in the bathroom looking in the mirror with a steady stream of blood running down his face.  Part of this is the tendency of the head to bleed freely, but it made quite the impression on all of us siblings as children...  Dangerous?  Maybe not so much? Mortifying at times?  Possibly.