You decided to poke your seatmate and tell him that the bell has already rung.

"Hey," you poked the boy, "wake up. Class is over."

He did not respond.

"Hello? Anybody in there?" You poked him on his shoulders again.

Suddenly the boy rose up. His parted hair bounced and slightly covered his drowsy face. He yawned, intertwined his fingers together, flipped them so his palms were facing outward, and stretched his arms. He twisted his torso to the right and left, making his bones crack, and let out a satisfied sigh. Then, paying no heed to your presence, he slung his black and white checkered backpack over one shoulder and walked past you like you weren't even there. 

How rude! 

Do you a)  let it go and walk away? or b) go after him and point out his rudeness

If you chose a) go to chapter 16.

If you chose b) go to chapter 17.