Flex your empathy muscles
This is essential. You will not be able to survive in this city, let alone as a public transportee, if you move through the world assuming that everyone's out to get you. That man that just squeezed into the crowded subway car that clearly cannot withstand one more human? Maybe he's rushing to the hospital to take care of a loved one and can't afford a cab. That woman that's taking up a whole seat with her tote during rush hour? Assume, for your peace of mind, that there's an adorable tiny pup in there. It's like a fun creative exercise that, in the end, will probably keep you from getting an ulcer.
[Photo via @edgar_the_mighty]