Daniel Sack has recently published Cue Tears: On the Act of Crying with the University of Michigan Press, which describes the book as using "tears as a prism through which to see some of the foundational problems and paradoxes of acting and spectatorship anew, including matters of authenticity and sincerity, the ethics of the witness, the interaction between a speech act and its affective force, liveness and documentation."
For more on Sack's work, view his faculty profile.