Birds freak me the eff out! I have been chased by geese, attacked by chickens and trust me - it was scary as hell. My mom was attacked so badly by a rooster when I was a kid, that when my dad got home, he chopped its head off. Not kidding.
Apparently birds don't like round cages. I had no idea until I watched this bird go off while his owner fixes his round cage problem. I guess there really is only one way to fix an issue like that and that's to totally destroy it.