Scariest Sign Ever
So driving to work the other day I saw the following sign in a neighborhood park:

(Photo taken from car)
This park used to be full of ducks... now there is not a duck to be found. I think it's safe to say that I have a somewhat unreasonable fear of snakes. As such, the only sign that I can think of that might be scarier would be:

For more on Flying Snakes.