The Lone Marker
Kids will be kids. There’s no stopping that. They’ll try anything and everything until they learn their lessons, which usually end up being the hard way. In one math class, in particular, students would toss things back and forth between the adjacent classroom they shared a wall with while the teacher wasn’t looking.
One time, a student launched his textbook towards the window. Instead of going straight through the window, it slammed into it and took down a shelf as it fell. Three math teachers immediately scolded them. As they were getting reprimanded, a lone marker flew through the window, like a lone warrior (via The Brainy Penny).