'Don't wash your car before going to that church.....'

It's been a very busy few days, and I don't seem to have got  much done; the domestic intray overfloweth, so to speak.  So  I really need to get on....

But before I do, I just have to post this picture, which I found at the irrepressible Bad Vestments blog:

Does anyone know if,   no, just...   why?