What seems funny to Pony Boy as they walk to the car in Outsiders?

In "The Outsiders," Ponyboy finds it amusing that he and Johnny are being treated like they are older than they are when they walk to the car. He laughs at the incongruity of their situation, feeling a sense of camaraderie with Johnny as they try to act tough, despite their youth and vulnerability. This moment highlights Ponyboy's youthful innocence and the pressure of living up to the expectations of his peers.