13 etiquette rules you probably never realized you're breaking

Flickr / Hakee Chang You may know the basics of etiquette,but there are probably some lesser-known rules you didn't realize you're breaking. According to experts, there is actually a correct way to pass the salt or stir your tea. There are also rules for stop signs, introductions, seating, and how you work out at the gym that most people don't know. You write thank you notes, keep your elbows off the table and would never think of eating until everyone at your table had been served. Your etiquet...