Funny crazy bird - Great Tit (Parus major)

wtf! this bird doesn’t have fear, not coward bird. Just attacking my fingers lol. I tried let him go away, but he always return to killing me :) I gave tons of food for this bird, but hey... still he wants eat my fingers also -.- That iron thing on his leg, thats ring. We did birdring on him for recording his flightway and age.