In Thailand, never criticise the king or the royal family. The Lonely Planet says so and every traveller you meet agrees that it’s a bad idea to get into that subject. The Thai truly love him and it would be ill-advised to say bad things about him.
When you are in Thailand, there are pictures of him and members of his family almost everywhere you look, from the more formal ones with his royal attire to more informal ones doing day-to-day things or activities related to the place that you are visiting. They even have comic books about his life and works!
Notice the smiley faces in the crowd behind him :).
But it goes deeper than that, in times of struggle, the Thai turn to their beloved Rama IX for counsel. It is a well-known fact that if there is a coup, the government will only be overthrown if the coup has the king’s blessing. Otherwise, it will fail.
That is all and well but what if I have more mundane problems and I want to know what would the king do? Let’s say I want to buy a camera and I’m undecided about which brand or model is the best. I may think “Gee! What camera would King Bhumibol recommend?”.