Was getting off a packed train and I was wearing flip flops on my feet. As I stepped down onto the platform a girl behind me must have stood on the back of one of my flip flops. As the crowd surged forward I felt a pulling sensation around the foot area. Crowd cleared and as I looked down I saw that as she had stepped onto the back of the flip flop I had moved forward, and was now standing there with just the plastic V between my toes, and the sole was under her foot! I actually said oh it doesnt matter, to this girl who was highly embarrassed, and off I toddled with one full flip flop on, and one with no bottom!