Please do it at home.

In the Japan Metro, they (I'm assuming "they" is the municipal government) run a public courtesy campaign. This campaign consists of posters depicting people doing rude things, and then a statement saying for you to do that rude thing somewhere else.

For instance, there might be a picture of people with backpacks in the subway eating and drinking and the caption reads "Please do it on the mountain." These campaigns are changed according to the seasons, so they run the "Please do it on the mountain" sign during the summer when lots of people are climbing Fuji.

December happens to be the party season, so the posters are more geared toward inappropriate celebrating. For instance, one shows 5 people drinking beer on the train and it says "Please do it at a pub." But no Public Courtesy Poster beats our current favorite:


"Please do it at home."