Shoyoroku - Case 25: Enkan's "Rhinoceros Fan" [1]

One day, Enkan called to his attendant,
  "Bring me the rhinoceros fan."
The attendant said,
  "It is broken."
Enkan said,
  "If the fan is already broken, bring me the rhinoceros himself."
The attendant gave no answer.
Shifuku drew a circle and wrote the ideograph "ox [2]" in it.

[1]: see case 91 of Hekiganroku.
[2]:  The Chinese character for "ox" (gyu) is one of the two characters for
     "rhinoceros" (saigyu = sai + gyu).