Christ but there are some horror stories in here. Mine are tame by comparison, but I do have a big one from this past year, at the very end. No classes involved, as it was more of a general thing.
<spoiler=Long boring anecdote within>I get along... shall we say poorly with people in my grade, for a variety of reasons, namely that they're annoying and spout ancient memes like they're the most amusing things to come from the internet. As a result of this, I have three "actual" friends, two of whom are a grade above (which this past year put them in a different school), and one a grade below (same school). Diablo 3 having recently come out and all of my friends being avid gamers, I wanted to discuss the game with my friend during yearbook signings, a ritual which I currently do, and likely always will, hold a bitter disdain for, and so went down to the gym where our two grades were being gathered. The teachers were shepherding my grade into one of the gyms (it's split by a wall of folding bleachers), at which point I extricated myself from the group and followed the path that my friend's grade was being led to.
At which point my 6th grade english teacher pulled me, quite forcefully out of line, and told me that I could not go into the other gym. The conversation was roughly as follows:
Teacher: [NAME], you can't go into this gym, only seventh graders can be in this gym.
Me: I just need to find my friend [FRIEND'S NAME], I can talk to him outside if it's that important.
Teacher: No, you can't come in! It's seventh graders only!
Me: And why exactly is it so awful to let an eighth grader in here? You know I don't cause trouble.
Teacher: You have to go back to the eighth grade group, [NAME]. The south side gym is only for seventh graders.
This argument goes on for several more minutes, standing at the friggin' doorway to the gym, until she gives up and gets the Physical Education teacher (who has never seen me before, since I somehow got put in adaptive PE) to literally push me away from the door, at which point they starkly refuse to talk to me.
This story is fairly tame compared to what some of the people in this thread have experienced, but I feel like it's still quite significant, probably only because it happened to me and I tend towards narcissism. But regardless, it's still a story of some fairly stupid teachers and/or stupid policies added to the long list contained in this thread.