A bread dropped on the floor should be picked up, kissed, put to one’s forehead, and then placed on the side.
In Chile, touching the food you eat is considered a faux pas and very unsanitary.
You don’t need to be a superfood to know that Italians take their food seriously. So, when in Italy, don’t ask for extra cheese on anything.
Being tardy is frowned upon almost everywhere except in Canada, where showing up early or on time is considered bad.