Here's an example of practical advice.
This is a sign on a pole in a train station in Tokyo. Loosely translated, it says, "Watch out for pigeon sh*t", with the exclamation point serving the dual function of emphasising the admonition, and also directing the reader to look up.
Tell-tale multi-coloured, multi-shaped splotches on the floor around the pole left me with no doubt that the person who created this sign was speaking from experience.
After snapping the photo, I calmly made my way to a less hazardous portion of the train platform, leaving less vigilant travellers to suffer the fowl wrath from above.