Yep, Wendy said it. It's called synchronicity. And it happens all the time. And once you are clued into it, it happens far more often that you would think. My personal belief is that we are constantly putting out energy (for lack of a better word), which interacts with all the energy around us. You could have taken another route, and so could have Susan, but the energies intermingle and BOOM you turn the corner and there she is. Sounds rather dry and scientific, but this energy is part of my concept of God (for lack of a better word).