"Jeez, [name], you really had to go after me twice today? I don't think I'm going to ever talk again in that class," my friend told me after a history class in ninth grade. "Sorry," I laughed. I'd only disagreed with his points. That was the whole point of seminar-style classes! His comment was a joke, right? It was not. He didn't share in class the next day, or the day after, or for the rest of the week. And...