Shoyoroku - Case 51: Hogen's "Boat or Land"

Hogen asked Senior Monk Kaku, 
  "Did you come by boat or by land?"
Kaku said, 
  "By boat."
Hogen said,
  "Where is the boat?"
Kaku said,
  "The boat is on the river."
After Kaku had withdrawn, Hogen asked a monk nearby,
  "You tell me, did that monk who was here just now have the eye or not?"