CLEAN : US TV pioneer David Letterman bows out

The transcript discusses the emotional experience of attending a show, particularly the last one before a comedian's retirement. It reflects on past shows and highlights the significance of the comedian's work, especially David Letterman's influence on comedy and American culture, including his role post-9/11.

What does the speaker imply about the audience at Chris Rock's last show?

What significance did the speaker attribute to David Letterman's return after 9/11?