I usually just look ahead. And glance at people occasionally. The worst is when you're only looking at someone through your peripherals, and the other person is doing their thing, and as you walk past each other, you both glance at each other, and there's that awkward second where you realize you were both doing the same thing.
--
Xbox GT/PSN name: TatteredUniform
http://www.scuffletown.org/wp-content/uploads/2010/05/tRBE1.gif