A Kid at Heart... and Body

My three students had all finally been claimed by their parents and had left. I sighed a relieved sigh and opened the door to leave. "Hey!" There's a tap on my shoulder. "You need to wait for your parent to... oh... sorry." I had turned mid-sentence and the teacher realized her mistake. "Sorry." What do you do?

"Don't worry about it. It happens."

And then you leave. And so I did. And now I'm home. And eating. And happy.