Life is a big old battlefield of social landmines we have to navigate and we will often fall victim to the bombs. Mistakes and public faux paws are going to happen. Trying to save face for ourselves is hard enough but, when we're trying to hide from the shame brought upon by others, it can be even more excruciating.
Public transit is bananas. It just is. It serves as the veins and arteries of major cities - and just like with veins and arteries in the human body, sometimes things can go horribly, catastrophically wrong.