I get people not being able to wait till a stop to vomit. But once I experienced the most absurd public transit vomiting episode ever: The tram stopped at a (duh) stop, and the doors opened. A man stopped at the opening, and vommited a huge load into the car. Like, he could have literally turned his head and vommited outside. Then he enters, sloshing through the vomit, leaving vomit-y footprints all the way.