As an adult, you're bound to learn that things don't always go your way. You're not always going to get that girl/boy you like to like you back, it's unlikely your apartment is going to look like one of those Pinterest mood boards and Chipotle doesn't always taste good ...
But you also learn how destructive this nihilism can be. Good thing kids don't have that word in their vocabulary (quite literally) and this stubborn kid in a taekwondo class proves it.
The little rascal was undergoing a white belt inauguration ceremony and had to break a board. Even after a few failed attempts, he refused to quit and finally showed the board who's boss.