He inserted his finger into the anus.

He likes to take a walk in the park at dusk.

Seeing his failure, we laughed like a monkey's butt.

He slipped and hit his backside.

We should always remember the power of Kannon in difficult times.

He is acting in a way that is like 'hide the head but forget the tail'.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.