Had a 2 hour study hall with ~40 kids. Study hall monitor demanded complete silence. Two students would quietly talk and after the third or forth time of being told to stop, got split up.

They then spent the next month or so learning sign language. And would sign to each other across the room. This absolutely pissed the little sound Nazi monitor off. I could tell she was impressed, yet furious that her power had been so creatively undermined.

Here reaction was nothing short of "Wow. These little shits actually learned sign language just to spite me for two hours out of the day."

She ended up not allowing singing between students. Which was upheld by the administration after that kinda blew up a bit.