Two stories:
In the bad old days of the fourteenth century, when the popes ruled from their palace in Avignon, the penalty for making substandard bread was severe. The guilty baker would have most of his clothes removed before being tied up in front of his shop, and then the good people of Avignon were encouraged to hit him with a stick as they passed by. The quality of his bread tended to improve dramatically.
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When normal methods of village diplomacy in Provence came to nothing, bread was the last resort. Once a year, on Christmas morning, villagers would take bread they had baked to the fountain, leave it on the edge of the basin, and take away a loaf made by a neighbor. This was said to renew good relations between inhabitants who had fallen out with one another during the year.
From Confessions of a French Baker by Peter Mayle and Gerald Auzet