The Bag Hoarder
A single lime doesn't really need a bag. Ma-Ti from Captain Planet is crying on your behalf, partly because of the bag, but partly because everyone just calls him the heart kid. He has a name, people.
The Armchair Environmentalist
Having ethics is a wonderful thing, until they become so rigid and inconsistent that a customer triple checks the carbon footprint on their hamburger and complains about apples not being organic enough, then buys kiwifruit that have been jet-fueled in out of season from New Zealand.