Though I do worry about your clickies their safety in the future if all these students are slacking off this much.
Oh, this is based on real-life experience. Chris's class had only three people in it, so it was extremely laid back. Not that they didn't work like crazy; they certainly took their learning seriously. But since it doesn't take as long to get through practice sessions with so few students, there was also plenty of time for pranks and horseplay.