During class you were interrupted by a student who had walked upto you, though after snapping his fingers at you and rudely grabs your attention by slamming a hand down onto the side of your desk. You try to protest but he shuts you up, walking away to the front of the class, he then writes on the board, while speaking loudly.

"You may call me Mr. French and I'll be your substitute for today.."

This teacher couldn't be at least 20 and telling everyone to open their textbooks to take notes?