Alex noticed everyone socializing, and decided he had enough. He walked out of the classroom, gently slamming the door behind him. 
"[b]15 minutes. I don't have to be there.[/b]" he said to himself, under his breath.
Walking down the hallway, he lit a cigarette and started smoking it. He leaned up against his locker, finished it, and closed his eyes. Alex turned his headphones on, sat on the floor, and started listening to whatever came on.