Once, there lived an old monk whose teaching method was truly unique. One day, he adorned his back with a tag that read 'I am a fool' and strolled through the city. While most people chuckled at him, there was one man who refrained. The monk, approaching him, asked, 'Why don’t you laugh?' The man replied, 'If I laugh at the text, I am laughing at myself.' Pleased by this wisdom, the monk blessed him and returned to his monastery.