One day, at the Guanyin Temple, in the midst of breakfast, a monk came to the abbot Zhaozhou  and said: “I have recently become your disciple in this Temple. Please guide me with your teachings, master.”

Zhaozhou asked the monk: “Have you eaten your porridge?”

The monk replied: “Yes, I have eaten.”

Zhaozhou then said: “Then go wash your bowl.”

http://pq_zen.tripod.com/zhao_zhou_wash_bowl.html

For some strange reason, I got all choked up and teary upon reading this.