Originally Posted by Fleck

In Ear Monitors. Stick them in your ears.

If anyone but an employee attempts to engage, one simply dismisses with a shoo-fly gesture of the hand and a grunt. The grunt should say,"move on." There need not be annoyance in your grunt. Grunt with no malice. An insulting grunt is not your goal. Practice in the mirror. Strive for a grunt that kills hope but no more.