Have you heard the phrase baker's dozen
? It means you are given 13 items rather than 12. According to Mental Floss
magazine, the origin goes back to the 13th century and Henry III. At the time, bakers were notorious for cheating their customers. King Henry tried to solve the problem by standardizing the weight of a loaf of bread. Cheaters would be punished severely. To be sure they were observing the law, bakers began adding an extra loaf to make sure the weight requirement was met. Admittedly, they did this under pressure; but their desire to be honest is still admirable.