Cramping joke

One day Xiaoming’s hand was plastered.
The teacher asked: What happened to your hand Xiao Ming said: Broken the teacher said: Why?
Xiao Ming said: Because I am too lazy, the teacher said: too lazy to break?
Xiao Ming said: I walked on the road and the shoes ran into a stone.
But I am lazy with my hands,
Just hold the pole and shake your feet to let the stones fall out.
Passers-by saw that I hit my hand with a wooden stick when I got an electric shock....................
teacher:............