Hekiganroku - Case 63: Nansen Kills a Cat [1]

Once the monks of the eastern and western Zen halls in Nansen's temple were
quarrelling about a cat. As he saw this, Nansen held up the cat and said,
  "You monks! If one of you can say a word, I will not slay the cat."
No one could answer. Nansen cut the cat in two.

[1]: Cf. Case 14 in the Mumonkan.