I was just settling in to my prep period when I got a call from the secretary. She needed me to cover another class. So, I trekked across campus to cover an 8th grade English class.
After that, I went back to the art class that was my assignment for the day. They were watching a video (the less said about that...). The middle schoolers were a little antsy, but nothing to worry about (especially considering the video).
It was the end of 5th period. The video was over. I had turned on the lights and collected the students' notes (they always take notes for a video, otherwise they won't watch it). That's when one of the students mentioned that he had me twice. He had been in the English class, too.
Never fails. Unless the extra period I cover is something completely different (I have freshmen all day, and the extra period is a class of seniors), there are bound to be a couple students who end up in both the extra period and the class I'm covering all day.
In that situation, I tell the students that I'm following them. While it may not be deliberate, it's true.