Teachers always left work assignments, so no teaching on my part, and I told them so. Every new class, I'd start by asking 'who doesn't care about school, this class, and work assignments? - no penalties for telling the truth". About a third would indicate they did not care, especially the older classes.
I'd tell them, 'That's fine, I don't care. I'll give the assignment - do it / don't do it. Doodle, sleep....your choice. No problems - you can explain to your teacher why your work was not done. But what you won't do is be loud, or in any way disruptive to the ones that do care and want to do the work."
Worked like a charm. A movie was made loosely based on my success...maybe you've seen it?