|Common Sayings with a Sinister Background
"Baker's dozen" was a way to make sure the baker was giving you your fair share.
You may be thankful to count on that 13th roll in your baker's dozen, but you can thank a rather sinister rule for its creation.
It all traces back to a 13th-century British rule called the “Assize of Bread and Ale”.
The rule stated that if bakers were caught selling smaller or low-quality bread to customers, they could have their hands chopped off.
That's why it was just easier to throw a 13th piece into the pile - Thus creating the ‘Baker’s Dozen.