Who knows the jokes of Chinese characters? be badly in need of

Once upon a time, there was a man who wanted to cut down a century-old tree in his yard. His neighbor asked him why he cut down trees. It's a shame to cut it down. He replied that the door of my house is a "mouth" and the word "sleepy" is at the entrance of the tree. If you keep this tree, my family will have a hard time. His neighbor said with a smile, then your family can't live at all! He hurriedly asked why, and the neighbor replied, you are human, and your door is "mouth". If a person's mouth is not a "prisoner", then you will not be a prisoner!