The lesson that lasted approximately seven minutes.
I had planned what I genuinely believed was the lesson of the century.
There were coloured cards. There was group work. There was a perfectly timed question sequence. There may even have been laminating involved, which should have been my first warning.
Seven minutes in, half the class had misunderstood the task and two students were debating whether cereal was soup.
I remember standing at the front thinking: I have absolutely no idea what I am doing.
So I stopped everything.
We laughed. I explained it again without the clever activity. They understood it.
Looking back, I think I learned something very inconvenient that day: sometimes my students need clarity more than they need my beautiful lesson plan.