Try not to show people the bottom of your feet, it is an insulting gesture in most parts of Asia. Specifically in Muslim countries this is considered insulting. An item related to this manner is when people in Asia take off their slipper or shoe and slap on someones head. This is the biggest insult you can give to a person. This is also related back to the bottom of the feet without the shoe on it.
Dec 30, 2013