Japan is a polite country, sometimes alarmingly so. People are bombarded with signs and announcements that constantly remind them of one thing: think of others.
The above sign shows a woman using a cell phone and a guy playing a Nintendo DSi, and it asks, "Are you too engrossed in your activity?" The notice is to ensure "smooth" exiting and boarding of the Osaka Monorail.
There is nothing wrong with playing a DSi while waiting for a train — though, it might be incredibly dangerous as evident by the young boy in Italy who was nearly flattened by a train. However, these signs are not for safety, but manners.
But in Japan, manners can enter minutia. And often do.
Train signs that say "no eating" or "no smoking" and "Give your seat to pregnant women and old folks" are most likely universal. But in Japan, manners can enter minutia. And often do.
In 2006, a slew of Nintendo DS games, such as Common Sense DS Adult Training, were released in hopes of capitalizing on the Japanese preoccupation with manners.