25-30 minutes of the lecture is devoted to teaching Bitzer's theory of the rhetorical situation (very important for the course), and about 15 minutes on the criterion of rightness-of-fit as the standard by which a critic judges the effectiveness of a speaker's response to a rhetorical situation.  I give multiple examples at the end of each section, so you may choose to use your own examples instead of mine.  The last short section of the lecture shows how the rhetorical situation theory illustrates what it means to have a rhetorical perspective as a disciplinary approach to knowledge.