You'd likely be politely told to mind your own business, or perhaps rudely. In between pushes there really isn't anything to do besides stand around. Usually we get a ten-twenty minute push every hour or so and then they trickle in the rest of the time. At my checkpoint we have two lanes. We try to keep five or six people on during lulls and then during pushes when we have eight or more screeners available we can open the second lane. And we can't open the second lane until a supervisor tells us to.