I’ve long loved the battle of the fish on the backs of cars.
I’m sure you know which ones I mean.
There’s the original one, two curved lines containing the word Jesus or sometimes just a small cross.

Then there is the one with the word Darwin inside, up on small legs, presumably walking out of the sea.

Sometimes you’ll see the “Jesus fish”:http://209.85.165.104/search?q=cache:n8MJnm9Rin4J:www.stickergiant.com/page/sg/PROD/j/os226+fish+jesus&hl=en&ct=clnk&cd=10&gl=us&client=firefox-a swallowing the “Darwin fish.”:http://evolvefish.com Other times it’s the other way around.
Fish, by the way, is ichthys in Greek, an acronym for Jesus Christ, the son of God, our savior. But no one seems sure why the fish became a symbol of Christianity. There’s more “here”:http://209.85.165.104/search?q=cache:RWeM2MgQ4cQJ:www.newadvent.org/cathen/06083a.htm+ichthys&hl=en&ct=clnk&cd=5&gl=us&client=firefox-a in the Catholic Encyclopedia.
But here’s one I saw the other day. A gelfite fish. It’s been around awhile but I had missed it.

Apparently there is a whole school of derivations: the Hindu fish, the pagan fish, an evolve fish on four legs with a wrench, even Satan with flames. More “here”:http://evolvefish.com.