Mystery solved! Probably! Thanks our perceptive readers, we have learned what was maybe on the mind of the lady we posted about yesterday, the one who was gently blocking access to an empty seat. Also, we've learned that SFist readers are violent, flatulent racists. Here's what she was probably thinking: "In my country of origin, I learned that public transit is lousy and over-crowded. So if I want to get off of this rumbling......