Shundo David Haye

'A monk asked, “What is the intention of coming from the west?” 
The master said, “A single stone in space.”
The monk bowed. The master said, “Do you understand?”
He said, “I don’t understand.”
The master said, “I trust you don’t understand. If you understood, I’d bust your head.”' (Jingde Chuandeng Lu)

Or, the note says, the stone would bust the monk’s head. Either way, this one got lucky.