If you're a tourist you should learn about the significance of colours in different countries.
For us, Europeans, the act of giving up means a white flag. But, for the Japanese, India and China, the white colour is the colour of mourning. Also, in India white means disease.
In France, red is the aristocracy's colour. This is what make the Egyptians remain shocked, because in Egypt red means mourning.
The Chinese can't understand why Americans chose the red light as the most dangerous terrorist threat, since in China red means wealth, happiness.
It seems that the French would never find a common language with Americans. In America green is the sign of safety, while in France the green symbolizes criminality. That's why Greenpeace can't act in French.
In the Middle East, the black is the colour of love, happy marriage and family happiness.