Do. Not. Litter! It's not a hard concept to grasp but so many people still do it. When a biker noticed a couple of guys in a Bentley leave their trash on the side of the road, he decided to get involved. When the biker caught up, he returned their trash to them much to their chagrin.
Meanwhile in Chicago, no matter what, if you're a pedestrian you always have to check both ways before crossing the street. Traffic laws are different everywhere, so you must look out for your own safety. One man didn't notice that he was crossing a two-way bike lane and inadvertently caused a biker to crash. The biker had to pop his knee back into place.