At least pranking teachers and bullying.What is the "start date" for "postmodern" in this context? Because I think disrespecting teachers goes back to antiquity.
My personal favorite story is a teacher who had to be in a torso cast due to an injury in the summer. He was teaching in a school that was known for disrespectful behavior and some gang activity. During the first week he had the window open and his tie was fluttering in the breeze. So, he grabbed the stapler and stapled it down to his chest. He didn't have any issues with disrespect that year
