I'm sorry prophet of pain but children don't develop the ability to have fun until they are at least 4 years old, sometimes younger for girls. If you ever see them smile or laugh before that time it's probably just gas and you need to smack them gently on the back with the palm of your hand until they poop. When he looked at the halo wars poster and then called you master chief he was probably mocking you because children are cruel at that age.