What is something I can say to the most annoying kid in the world?

This little annoying kid keeps talking trash, he is so bad at everything and no one likes him. He thinks he is so funny. He laughs at his own jokes and everyone just looks at him like he is stupid. What is something I can say to put him in his place. I literally want to punch him in the face multiple times till i can see his gay little smirk anymore.