Since this film could be called a sleeper hit at best, many are unaware that there actually is a sequal. I can't remember the name...something like The Empire Strikes Oil, or something like that.
WARNING: MAJOR SPOILER HERE:
Remember how Obi-Wan said Vader killed Luke's father. Well, Vader actually is Luke's father. He tells him at the end after chopping off his hand. It was sooooooo cool; I made a face like this: