If you needed proof that all cultures have something in common: This is it. As it turns out, that end piece of crusty bread is regarded in a similar, if not identical, way in each culture. Forever an outcast, or as the Scottish put it: an outsider, that end piece of bread is regarded by all to be an inferior or unwanted portion, earning names like 'The Mother-in-Law,' the 'Butt' 'Boss,' 'Heel,' 'Nob'; all terms being derogatory, unwanted, and utterly dreadful, dirty things. This is a topic that…