One guy was sitting in traffic and wanted a little excitement to make his drive a little less boring. He decided to play rock paper scissors with another driver to see if they could merge in his lane. His inexperience was showing through while he was challenging his opponent calling the game paper rock scissors.
This does make us think of a potential future blockchain for autonomous cars. The cars talk to each other and play a virtual game of rock paper scissors to see if they can merge in front of behind another car. Who knows, maybe you could just compete with people in the opposing car.