Eating or drinking at a business meeting during month of Ramadan

Planning meetings or conferences on a Friday

Keeping your shoes on when entering a home

Giving a firm handshake

Not tipping

Showing the soles of your feet

Telling people to help themselves

Giving the fig sign or the "got your nose" gesture (hand in fist, thumb between index and middle finger)

Giving the A-OK sign

Blowing your nose

Having one hand in your pocket

Wearing shorts in public

Keeping your clothes on in saunas and steam rooms

Giving the thumbs-up

Touching someone

Using your left hand for anything