Bombed Lesson Plan

Today started out like any other I had been gearing up throughout the week to teach this new lesson to first hour I had even gotten it pushed back a day to further prepare to teach it.  I was going to teach first hour how to layout the grid method on a sheet of paper.  I got into the classroom and prepped everything.  Once the students came in and I had taken attendance I started the lesson.  I thought I was doing pretty well until I choked trying to do some simple math in my head.  From that moment on it was a straight nose dive of a crash.  As my supervisor informed me later on I lost the lesson even earlier on when the students were not engaged to what I was saying.  Needless to say this is one that I am going to have to redo.