This photo sums up my experience of Tokyo's subway system. People move so fast. At one station, I just stood there as people exited and crammed back into the cars. The cars would get so packed that people near the doors exited to let those poor souls in the middle out. Once they were let out, the waiting party shoved back in, squeezing every inch of standing space available. It reminded me of a time I used to play with Play Doh. Remember shoving the doh back into the container when you were done playing with it? Yeah, it was like that.