A little boy is watching a building burn down. He turns to his mom and says "This is horrible. Property will be destroyed and everyone in there is going to die." His mom told him that everything would be okay once the fire department got there. The boy asked "Who are the fire department." His mom said "You'll see." A few minutes later, he hears sirens and sees flashing lights. Firemen in full gear start running into the building to rescue people; others start quickly putting out the fire. No one is hurt; very little damage is done. The boy is so impressed that he proudly tells his mom "Wow mom, they saved all those people. I know what I want to do when I grow up. I want to be a fireman." His mother shakes her head and casually replies "Oh Tommy, you're not gonna grow up. You have leukemia."