Sentence:  I saw her quiver and kept a wary eye on the ginger ale bottle. But even if she had raised it and brought it down on [my<!--orig. "the Wooster" said by Wooster about himself-->] <WSD>bean</WSD>, I couldn't have been more stunned than I was by the words that left her lips. / [...]/ <!--ch. XV--> Well, as I say, it was from his fertile <WSD>bean</WSD> that the idea sprang. 
Meaning of the word marked with <WSD> tags:  The head or brain.