There was once a village, where lived, two zen masters. One was studious and steadfast, very often to be found meditating, studying, or helping others. The other was the opposite. He slept when he felt like it, ate when it was amenable to him, drank often, and enjoyed the company of others.
They were both well known in the town. The serious Zen Master, was known for his constant charity and good deeds. The other Zen Master was known for his lack of punctuality, good cheer, and was the life of every occasion.
One day, the serious Zen Master, after many years of building slight irritation and resentment towards the other, finally sought out the other. He rebuked him for his lack of seriousness in his meditations, studies, and charity. He especially rebuked him for his drinking.
The other Zen Master replied in a slightly irritated tone, "A person who can't tolerate even a drink or two, now and then, to me, isn't even human..."
The serious Zen Master, now properly vexed, replied, "Oh, well if I am not human, than what am I?" "I'm some how sub-human because I am mindful of my Zen Practice?"
"Quite the contrary," replied the other Zen Master. "I'd suppose they were a Buddha."
The other Zen Master was stunned for a second. He became at ease, for the first time after many years. Then he suddenly became embarrassed at the prospect of his former trouble, quickly regained himself, laughed, and said, "you are a ******* to the last aren't you?"
The other smiled and replied, "Perhaps; now, care for a drink?"
"Perhaps," replied the other.
The other poured him a drink and they proceeded to sit together, share stories, laugh, and enjoyed each other's company, for the first time, in a long time. The other, however, became a bit drunk, after a few hours. The Serious Zen Master, having drank in careful moderation, observed this in charity, and good spirits. He put the other to bed, tidied up, and left quietly, with a genuine smile on his face. He felt light, as he walked home. The autumn leaves, and the shimmering moon, were particularly beautiful, that night...
(I got this one from "101 Zen Stories", you can find it read by Coyote Peterson on youtube. I recalled this one from memory and embellished a bit...)