Every so often, some creationist will come out with the claim that flagellum of the bacteria is an irreducibly complex system. This points to
a dead-Jew on a stick designing it- I mean, an unspecified intelligent creator (wink, wink)- designing it.
The only problem is that we know that the flagellum is not irreducibly complex. It can be shown to form in a stepwise fashion as per the article attached.
Of course, it does seem that it would be easier to find another way to leave a biological clue for design than the flagellum of a bacterium. That creator is such a tease…