SUBJECT TO CHANGE
After a lesson she had spent eight hours preparing for was killed because of scheduling changes, English teacher Waterfall goes metaphorical:
Imagine a schedule is a rug. A small rug on a slippery hardwood floor. It can be moved around, and it slips every now and then, but you like to think that it's going to stay put when you're standing on it.
Now, imagine this: Every time you set foot on the rug, someone comes up behind you and whisks the rug out from under you. You go flying and crashing as if you've stepped on a banana peel.
That's what being a teacher is like.
Bet they don’t tell you that in ed school.