Don Quixote: That Was Odd

Chapter XLVIII

In the middle of the night, Doña Rodriquez visits Don Quixote and tells him about a daughter she has who is in love with a young man who had promised to marry her but has since broken his promise, and that her entreaties to the duke go unheard.  Next she begins to tell something strange and personal about the duchess when suddenly someone enters the room, attacks the duenna, spanks her bottom, does the same to poor Don Quixote sitting innocently on his bed, and then flees the room; it is unknown who it is because the room is dark.