Yantou Xuanjian, Qinshan Wensui, and Xuefeng Yicun studied with Deshan Xuanjian. One evening the three were walking together in the courtyard and came upon a pail of water. Qinshan commented, “When the water is still, the moon comes out.”
Xuefeng countered, “When the water is still, the moon doesn’t come out.”
Yantou pushed the pail over with his foot and continued walking.
[Yantou Xuanjian – Zen Masters of China: 235-40]