You can usually tell how inappropriate a sign is by how long it takes you to figure out the original intention behind it. With this one, we're still not sure. Presumably, it's encouraging children to annoy their fathers until they stop the family station wagon for a  Butterfinger Blizzard break, but tell that to the weirdo who chose to hand-paint it in large, Serial-Killer Serif font. Then try to keep him talking until the police arrive.