Indonesians smile a lot to initiate contact, it is highly recommended to smile back in return.[6] When interacting with other people, one should avoid expressing negative air of resentment, arrogance or hostility. Smiling, even toward strangers that you are interacting with, or someone that accidentally met your eyes, is considered polite and could be a social ice-breaker and to sign that you are approachable. Probably that is why Indonesians are rated highly as the most smiling people in the world