How many other things did he try before he was successful?
 It depicts a young boy dressed in Vader's black robe and helmet feverishly trying to get something -- anything -- to obey "The Force" and bend to his will. He tries the washer and dryer. A doll. A sandwich. Nothing happens. Not even the family dog is moved. 

But when he tries to wield "The Force" on his dad's new car, the engine roars to life -- with a little help from dad and his keyfob, of course.  