Shoyoroku - Case 33: Sansho's "Golden Scales" [1]

Sansho asked Seppo,
  "When a fish with golden scales has passed through the net, what should
   it get for food?"
Seppo said,
  "I will tell you when you have passed through the net."
Sansho said,
  "A great Zen master with 1500 disciples doesn't know how to speak."
Seppo said,
  "The old monk is just too busy with temple affairs."

[1]: see case 49 of Hekiganroku.