In Persian culture, if someone gives you the "thumbs up" gesture, he is wishing you good luck.
In Indonesia, If you have your hands in your pockets it is a sign of:
Rudeness and Arrogance
In Western cultures, mutual eye contact is a sign of respect.
In some Carribbean and South Asian countries, also Australian Aboriginal culture, it is a sign of respect to not make eye contact with superiors and elders.