公案 · kōan

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居士因在床上臥看經。有僧見曰:「居士看經,須具威儀。」士翹起一足。僧無語。

Layman Pang was lying on his bed reading a sutra. A monk saw him and said, "If you read the sutras, you have to sit with proper bearing."
Pang stuck a foot in the air.
The monk had nothing to say.