this7a.js

function setMovie(movie) {
  this.movie = movie;
}

var theater = {
  loadProjector: setMovie,
  
  playMovie: function(movie, previewLength) {
    this.loadProjector(movie);
    
    setTimeout(function() {
      console.log("Now playing: " + this.movie);
    }, previewLength);
  }
};

theater.playMovie("Gremlins", 1000);  // "Now playing: undefined"