"Why are you walking sideways like that?" asked the Mother Crab to her son.
"You should always walk straight forward." she said.
"Show me how to walk, my mother" said the little Crab. "I want to learn"
So the Mother Crab tried to walk straight forward,
but she could only walk sideways like her son.
Whenever she tried to walk straight forward, she would fall down.
Lesson: Do not tell others how to do something unless you can show them a good example.