David Bernstein likes the Darwin fish. Sasha Volokh doesn’t, and laments that there’s not a separate symbol for creationists, so that we evolutionists could just make fun of them, without casting aspersions on more enlightened Christians.
But there is a separate symbol for creationists: the Truth eats Darwin fish, which I see a lot of here in Memphis, and which qualifies as my least favorite car decoration. (Close second: those decals with Calvin peeing on a Ford logo, or a Chevy logo, or anything else for that matter.)
I used to have a Darwin fish on my car, until I concluded that it was responsible for several instances of vandalism. (This was in Rochester, NY.) That is to say, some person or persons who were offended by it were responsible for several instances of vandalism. The fish itself did not throw a brick through my car window, nor did it bend my antenna and stomp all over the roof of my car.
My personal favorite is the Cthulu Fish. “Cthulhu for President: why vote for the lesser of two evils?”