[tipokot]

When I was consulting for telecomms company in Bangkok all non-Thai had to attend a one day seminar on "Working with Thais".
During this seminar they tried to teach us the 20 "basic" smiles with the added advice that just because a Thai is smiling doesn't mean they are happy, happy with you or pleased to see you.
Having said that the genuine happy smile is wondrous to behold....especially from the kids.