Post of a friend of mine off of Facebook:

Last week my student decided we were going to do a comedy act. He is the boke and I am the tsukkomi.
Him: (In English) My name is Kim.
Me: (slaps him on the head) なんでやねん。
私がキムよ。
Everyone: (laughs)
Too bad he makes me practice it every time I see him.

I forgot to mention I do a gesture at the end where I clasp my hands together and tilt my head. Lol