The raving man shouts
"Yo man, I got one kidney!"
Unzip. Splash splash splash.
After a few minutes of accusing his fellow passengers of excessive interest in his manhood, the fellow made the aforementioned proclamation and lurched out the emergency exit into the space between the moving cars (illegal). Then he peed, yelling and waving one fist at us all the while. He reentered the car, returned to his seat, and ranted at some young women about their excessive interest in his manhood.
There are two takeaways here:
1. Public urination is never okay.
2. I think I speak for women everywhere when I make the following announcement:
Dear men: women are not currently, never have been, and never will be nearly as interested in your penises as you think we are. In fact, we will never be HALF as interested in your penises as you are. Accept this fact and move on with your lives.