Bold. Informative. Leaves nothing to the imagination.
I took this picture the last time I was walking through the bus station in Seoul. Its a good thing, as I now have a personal reference to the One True Way. Sadly, however, the wisdom of this sign is only partially observed: while the “piss wherever” bit on the left is an accurate depiction of what appears to happen around here, the “drop blue balls into a hopper” directive seems to have been completely ignored by all but the most sophisticated socialites.