Puppet show humor!
   Darth Vader and Luke Skywalker are marionette.  Yoda controls Darth
   Ender's strings.  Emperor Palpatine controls Luke Skywalker's strings.
   If you're not familiar with the movie, Vader is the epic archvillain,
   Luke is the epic hero, Yoda is Luke's mentor, and Palpatine is Vader's
   boss, so I described it backwards, crossing good and evil with who is
   in control of whom, just like blowback in real life.
   The job of Vader is to get Palpatine to kiss Yoda by how they dance
   with Luke.
   ...