via vintage japanese subway posters circa 1976-1982:

watch where you spit out that chewing gum, superman might get stuck.

charlie chaplins do not approve of lollipop-headed hitler.

supeisu inbeidaa!

“umbrella of no return” starring marilyn monroe.

don’t think you’re cinderella when the train is about to depart.
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these are pretty awesome! i saw some hysterical subway ads in Japan when i was there in march. If i find them online, i’ll send them to you. they’re really great.
here we go:
http://gizmodo.com/5422462/japans-subway-etiquette-posters-warn-of-drunkeness-cuddling-and-crying-women/gallery/