The karate chicken

In my class was a boy named Johnny, he once told me he heard his friends speak about a karate chicken.

Wanting to find out more, he went to a farmer and asked for a karate chicken.
The farmer gave him one for hundred dollar and said: 'just shout "karate karate" and then an object, and the karate chicken will completely destroy it'

So Johnny went home with his karate chicken and yelled 'karate karate closet'
The chicken jumped up and destroyed the closet, then Johnny yelled 'karate karate mirror'
Again the chicken jumped and destroyed the mirror.

Then his father came home and saw the destroyed closet and mirror. Furiously he yelled: 'what the hell is going on here'
Johnny replied: 'look dad, I have a karate chicken'

'Karate chicken?' His father yelled
'karate? karate my balls!'

Edit: added a '?'