This happened a few weeks ago.
My 4th period class (math) is split in half for lunch, so you have half the class, eat, and then come back for the second half. When the bell rang for lunch, I needed to go by my locker to get a book for my 5th period class because there wasn't enough time to go after 4th period (the math and english wings are on opposite sides of the school, and though they are both on the 2nd floor, the floors aren't connected and it's impossible to get to my locker and class in time).
As I was walking down the main hall, our school police officer stops me.
Her: Where are you going?
Me: My locker.
Her: You can't go now.
Me: Why not?
Her: You have to go as soon as the bell rings, not in the middle of the period.
Me: The bell JUST rang.
Her: What?
Me: The bell just rang now.
Her: Well, you're late for class then, come with me.
Me: No, I'm at lunch right now.
Her: No, you can't be at lunch right now, the bell just rang.
Me: What? The bell JUST rang to go to lunch and you're allowed to go between classes, right? [the lunch before me goes to their 4th period as my class leaves for lunch...so it's considered a class change]
Her: Yes, but you have to go when the bell rings.
Me: [frustrated] But the bell JUST RANG A MINUTE AGO!
Her: Oh, well I mean the end of lunch bell. You can't go now.
So, eventually give up and play by her rules; and of course, because my locker is on the other side of the building, I ran to it, got my stuff, and had to run to make it back to my 4th period on time...and the woman yells at me for running!!!