三四杠子 Three or Four Blows Taken
八戒道:「山凹內兩個女妖精在井上打水,我只叫了他一聲,就被他打了我三四杠子。」行者道:「你叫他做甚麼的?」八戒道:「我叫他做妖怪。」八戒道:「山凹内两个女妖精在井上打水,我只叫了他一声,就被他打了我三四杠子。」行者道:「你叫他做甚么的?」八戒道:「我叫他做妖怪。」
逐句解 Line by line
Bajie said, "There are two women fiends down in the hollow drawing water at a well. I gave them one shout and they laid three or four strokes of the pole across me."
Note how he tells it. He gave them one shout; they hit him four times. The arithmetic is doing the arguing, and he leaves out entirely what the shout was.
Pilgrim said, "And what did you call them?"
The one question that undoes the whole account, asked without comment. Pilgrim has already worked out that the missing piece is the wording.
Bajie said, "I called them monsters."
He answers honestly and without the least suspicion that this is the problem. That is the joke, and it is why the confession has to be given its own short sentence.
Three short exchanges, and a small comic machine has been assembled. Bajie's version omits the cause; Pilgrim asks for it; Bajie supplies it cheerfully. The audience is ahead of him the entire time, which is where an audience most enjoys being.
The technique here is dialogue as cross-examination, and the novel uses it constantly. A character reports events with a gap in them, another character finds the gap in one question, and the gap turns out to be the whole story.