They use pictures of pigs when it's really getting serious

Sometimes I found some advertisements that have a complete style switch from all the others: no screaming colors, no child garden things, but just a sober style in black and white. Most of them are for something like business meetings I suppose. But the strange thing is that a lot of these posters place a picture of a businessman and, the strange thing: a picture of a pig. And I must honestly say, that I still didn't figure out what the magic combination between businessmen and pigs say about Hong Kong. I really don't know.