Elbows Off the Table!

Turns out your mom was trying to protect you from being shanghaied into service.
The story goes that shipboard life in the early days was hard, such that sailors would often disappear while in port. Ships left stranded for want of crew would scour the local taverns with the intent of commandeering men while in a drunken stupor. Once sober, the ship would be out to sea and escape for the captured workforce would be impossible.
Now the savvy subjugator could detect an experienced seaman by looking for a particular habit. Eating with elbows on the table restricted a sailor's plate from sliding away when the ship pitched and rolled. A man with this custom was a pretty good sign of a man with shipboard experience. So through the guise of bad behavior, mothers instructed their children to keep those elbows off the table, and hoped this would keep their boys on dry land.
The story goes that shipboard life in the early days was hard, such that sailors would often disappear while in port. Ships left stranded for want of crew would scour the local taverns with the intent of commandeering men while in a drunken stupor. Once sober, the ship would be out to sea and escape for the captured workforce would be impossible.
Now the savvy subjugator could detect an experienced seaman by looking for a particular habit. Eating with elbows on the table restricted a sailor's plate from sliding away when the ship pitched and rolled. A man with this custom was a pretty good sign of a man with shipboard experience. So through the guise of bad behavior, mothers instructed their children to keep those elbows off the table, and hoped this would keep their boys on dry land.