Solve the corporal's smell and laugh. Just laughing is not enough.

Why do people laugh? Because I was poked at the punch line! Why do people laugh? Because of psychological potential difference? What is psychological potential difference? Because people have inner likes and dislikes! Why do you say the same thing, some people are angry and some people laugh? Because being poked in the right direction will make you laugh, and being poked in the opposite direction will make you angry! Why did the corporal laugh? Because he was stabbed in the right direction! Why didn't corporal get angry when he heard about it? Point the same thing directly at the corporal, and he will be angry! So the words of Tao never point directly at anyone! So the corporal smiled because he thought it was a mistake! So the sergeant was confused, because he couldn't figure out whether it was a person or himself! Therefore, the staff sergeant is careful, because he knows that what makes him laugh is his ignorance!