One day, Jack broke a bowl when washing dishes and his grandpa slapped him in his face without consideration.That evening, when this family was having supper, Jack's chopsticks fell and grandpa stared at him angrily.Jack suddenly cried out.Jack's father asked:"Why are you crying?"Jack answered:"your father slapped me." "This guy is telling on me now?" thought grandpa.Father angrily walked up to grandpa,slapped himself in the face twice and said:"You slapped my son once and now I've slapped your son twice!"