The classic catchphrase "If there's a sign, there's a story" seems a bit over the top until you come across some scary signs near dangerous locations and realize they have a reason to exist and warn people before they do something stupid.

From cautions and unusual warnings about rock-throwing monkeys to messages like "It may explode and kill you," these signs reveal the strange and often dangerous realities in our world.

Not all signs are very obvious and explicit, like the small yellow sign near a beautiful lake in Austria that indicates you might get struck by lightning if you are near the metal bars. Let's check out these 23 scary signs that surfaced online.