Blinkers in the classroom

I politely asked Joe B if he could work quietly for a while, not distracting anyone or being distracted.
His reply
'Miss Mary, as I have told Miss Muyassar before the only way I would not be distracted would be if I wore blinkers."
This was my solution - a barricade of Dr Naji's special plastic test separators.
It worked for a while - but he was soon chatting away again.
Love the chemistry class.