A few weeks ago, I was boarding the bus on my way home from the gym.  A girl stepped on behind me and sat a few seats down from me.  Both of us having presumably recently finished working out, we simultaneously reached into our bags and pulled out perfectly identical water bottles and took a drink.  Halfway through swallowing, our eyes met and we realized the coincidence we suddenly found ourselves apart of.  Most of the other passengers on the bus had all noticed us as well, and I had the strange, yet oddly pleasant experience of being apart of a group of strangers as they all break out into a flurry of half-stifled giggles.