I spotted this sign on the back end of a car several weeks ago. The car was also adorned with a rather garish flying pig hood ornament.

According to Wikipedia, the know-all, end-all electronic Encyclopedia for the ages, here’s an explanation for pigs flying -
A flying pig is a symbol of an impossible event coming to pass. The popular saying “[it will happen] when pigs fly” (or when pigs have wings) is traditionally used to mean that the specified event will never occur.
Although there are several opinions about the origin of the saying, in Cincinnati, the story is that when the hogs were delivered from one side of the river to the slaughter house on the other side, they were loaded on flat top barges. As they stood on the barges and moved across the river, the early morning fog would often rise off the water and cover the barge bottom. The only thing that could be seen were the pigs “floating” above the water. This gave the appearance, according to the locals, that the pigs were “flying” across the river. This is the reason that so many “flying pig” items can be found in the airport and in other gift shops around Cincinnati.

I can’t guess what this all meant to the car’s owner, but it must have been very important.
And good for you, Cincinnati.
Just fodder for your mind.
gilmark