Run!Its The Tribe Of Gum!

               ...With the safety of the Tardis within reach The Doctor paused breathlessly and looked back for signs of the pursuing cavemen of the Tribe Of Gum. With a resigned sigh he thought to himself
              WHY DO I HAVE THE FEELING THIS IS JUST THE BEGINNING OF A BEAUTIFUL RELATIONSHIP?
               A hail of spears and stones answered his unspoken question.
               And he ran for his life.