That mental image, though

found on Reddit

Deterrence is ultimately a mental exercise, it operates on the mind of the people you hope to deter. As such, it's probably a good thing to try things a little off the beaten path because "Danger!" and "Keep Out!" are things people have seen a million times and so are desensitized. This one paints a very evocative mental image, though maybe it sparks a bit too much curiosity.