Last film class of the semester, on Peeping Tom and some of the ideas of scopophilia behind it, especially from Freud and Fenichel.  What is the MacGuffin in Peeping Tom?  In a way (though I run out of time to say it this way): it's a meta-MacGuffin: we are trying to figure out which of many possible things the MacGuffin is going to turn out to be.  That's what we're looking to discover.