Reply To: "Shut Up"
This sounds like an old joke we used to tell years ago. Q: You know how to get a guitar player to stop playing? A: Put a piece of sheet music in front of him!
In the classroom, I use what we call “rest position” which is placing the guitar strings down into the lap. That is not a total solution because some students use the back of the guitar as a drum, but it helps.
I know a teacher who calls for rest position and students fold their hands on top of the guitar while in playing position. This eliminates moving the guitar. It also eliminates drumming on the back of the guitar. As long as the hands are folded, there is no chance of playing or making a sound.