Most warning signs are generic, "Yield"-type offerings completely lacking in creativity and flair -- so if the people putting them up can't be bothered to make an effort, why should you? Cataloging rare examples of inspired signage, Oddly Specific.
From the prolific nerds behind Seattle-based FAIL Blog and Hawtness, this budding pictorial library consists of signs "captured and displayed to glorify their specificity", whether they be on the road, in the restroom, or along the McDonald's drive-thru, which coincidentally puts you back on the road, then straight to the restroom. Some prime examples:
Will I Be Timed: An above-toilet sign reading "Please flush for 35 second so it can go through" on which an OC-defecator, after rigorous road-testing, has helpfully crossed out the "5" and replaced it with a "2"; because bad grammar stinks, he has also pluralized "second". Thank!
Posted No Fetching Zone: "Warning! Hazardous Cliff" also advises to put your pooch back in your vehicle because "Many dogs have died here", driving the point home w/ an image of Fido soaring majestically over the edge -- tragically leading to people tumbling down the slope after attempting to peer down at the pile of dog skeletons.
Consequences: Promises unauthorized vehicles will be "worked over with a sledgehammer, flipped over by an angry mob, set on fire, and spray painted with rude slogans immediately after after being used as a getaway car in an incredibly daring daylight robbery". So, the White Center treatment?
Of course, much of the signage will be counterproductive, like a trash can reading "Caution: please open carefully as there might be a squirrel inside" -- when there's a chance at surprising Garbage Squirrel, how could you ever yield?