In Australia there are very unusual signs, especially on country roads. For example, this - if you do not want to get own headstone, be careful with the animals specified on the label (and meet them on Australian roads can be easily)
And this sign alerts you that the next 42 km you have to be extremely careful not to shoot down wild animals on the road.
That's what would happen to animals and with your car
Here is an example of an unusual road warning sign
"If you drank ... '