If etiquette goddess Emily Post had Instagram, she would double-tap the hell out of the image shared on Big Blue Bus’s account three days ago. The paneled shot promotes “#GoodKarma” and “#BusEtiquette” as they apply to bus riders who bring backpacks on board, although we would argue that giant gym bags, oversized totes, and messenger bags fall into the same category. The rules are easy. One: remove your backpack while standing on a crowded bus (are you trying to get pick pocketed?), and two: don’t take up an extra seat simply to feed a manspreading addiction. Apparently common sense isn’t as common as we thought.