Long long ago in a galaxy not so far away George Lucas studied folklore and myth and made movie history. The trilogy's screenplay is based on Mythologist Joseph Campbell's Hero with a Thousand Faces, itself a publishing phenomenon outlining the hero journey. Psychologist and author Dr. Jonathan Young assisted Joseph Campbell for many years and later became the Founding Curator of the Joseph Campbell Archives and Library in Santa Barbara.
Movies begin with a regular person and the situation begins as mundane.
The familiar everyday circumstances let the movie audience know extraordinary things can happen in ordinary everyday lives. Tragedy often sets the story in motion. This is the summons, the call to adventure, the quest, an inner calling. The devastation of Luke Skywalker's home. It draws us into the engagement.