Trying to raise the dead

Every day a man enters a bus at the same stop and anounces "The big John never takes tickets". The driver, being skinny, never dared to challenge him, but was very irritated. So he went to a gym and after training for 6 months felt confident that he could stand up to the big man. As usual John gets into the bus and anounces that he never takes tickets. The driver turned off the engine squared upto him and barked "Why not". "Because the big John have free pass!"