DO ADVISE a person in advance if you want to remove some fallen article on his hair that gets on your nerves. Either he does it or he will let you do it. That's about the only time you can touch his head, where good manners are concerned in Thailand. Do it unannounced and you could end up in some hospital bed. Do it to a woman and you will end up also in some hospital bed but in the intensive care unit. The woman will not slap you-as we sometimes see in the movies but her boyfriend will, if he is in a foul mood.