Brownian motion (brounēən ˈmōSHən)
1. The erratic random movement of microscopic particles in a fluid, as a result of continuous bombardment from molecules of the surrounding medium.
2. The activity of a crowd of middle-aged men calling home on their cellphones as they wander the aisles in Whole Foods on Thanksgiving morning.
(Note: You’d think there’d be a decent photograph of this common phenomenon, but it’s apparently classified information. If that Julian Assange fellow ever had to do his own shopping, you’d damn well bet there would be pictures of other people embarrassing themselves.)