When I was younger I took in a large south american parrot. A bit smaller than a cockatoo, green feathers with purple and yellow streaks in them... pretty cool, never knew what the species was. It was given to me by a lady with a bunch of kids who TERRORIZED THE BIRD!!!
Tried being friendly, tried wearing gloves and taking my time, tried for nearly 7 months... never once would let me go near its cage, or not try and attack me when I fed him. Just gave him to a breeder in Toledo, Ohio... bird was just plain MEAN.
Had a cool cockatiel that could say a few words though!