Here is a story I read recently from Cold Mountain (Han Shan 寒山). He was a famous Zen (Chan) poet from the Tang dynasty. This story always reminds me of the PGSG passwords.
One time Han Shan was leading some oxen over towards where some monks were lecturing about the Buddhist precepts to a young group of novices. He leaned against the gate of where the monks were, clapped his hands, and chuckled, "What a throng! What's all this milling about?" One of the senior monks shouted angrily, "You stupid lunatic! You're interrupting our lecture on the precepts! Han Shan laughed, "No anger. That's the precepts. When your mind is pure then you're a monk. Our natures are one. There's no distinction in the light of the dharma."
When Han Shan speaks thusly, he is my master. Although I wonder if he'd slap me on the side of the head if I recognized him as such!