Sometimes it happens: didn't sleep well, woke up early, went back to sleep and had a bad teaching dream (they showed up in a room I hadn't been told about), and so on.
So in the rich tradition of interior monologues, as I was preparing to leave for the day, one part of my brain said, "I don't feel like teaching today."
Up pipes a John Cleese voice from the "Dead Parrot" sketch. You know the part where Palin tells Cleese, "Beautiful plumage, the Norwegian blue" and Cleese answers "The plumage don't enter into it. It's stone dead"?
Yes, a John Cleese voice popped up inside my head and said, "Your wanting to teach don't enter into it."
I laughed, got in the car, taught all day, and had good classes. It's true: when they're expecting you to show up, your momentary thought that you might not feel like it don't enter into it.
(Link to the sketch: Dead Parrot Sketch)