author Tim Ferriss’ exercise for eradicating self-consciousness in public:

…simply lie down in the middle of a crowded public place.  Lunchtime is ideal.  It can be a well-trafficked sidewalk, the middle of a popular Starbucks, or a popular bar.  There is no real technique involved.  Just lie down and remain silent on the ground for about ten seconds, and then get up and continue on with whatever you were doing before.