17. India & the Middle East
In many parts of the world including the United States, you were probably taught from birth that you should always shake with the right hand.
In India, the Middle East, and other parts of the world, the right hand is strictly used for hand shaking, eating, and touching things. The left hand is considered unclean. The primary reason is because the left hand is used for…cleaning up unclean parts of you. In some places, you use your left hand to wipe yourself. This one is not only a cultural faux pas, it can also lead to diseases, excessive hand washing, and followed by bouts of cringing.