There is a teacher at my school, and she is the most strict person I have ever seen. If you go above a walking speed for even half a second and she sees you, you get lunch detention.
when the bell rings and the science teacher finally dismisses us (I'm already late cuz of her) she makes us stay on the walls and wait until the crowd dies (then the 3rd bell rings and I'm more late and get in trouble) and when I ask her y she does this she said "cuz I dunno"