I have a loaf of bread in my house. If you were to draw a straight line between my loaf of bread and every slice of meat on the planet earth, it is almost a statistical certainty that, in at least one case, if you extended that line past the slice of meat you would hit another loaf of bread. Thus, these loaves of bread create a sandwich. Due to the abundance of loaves of bread and slices of meat in the world, it is safe to say that nearly every loaf of bread is currently creating a sandwich with another loaf of bread somewhere else on the planet.