what’s wrong with this picture?

I had just enough time this afternoon to follow a “Covered Bridge” sign that had been tempting me for quite a while now–camera in tow, of course. It proved to be a highly satisfactory detour and also provided an occasion for me to have a bit of photographic fun with the result . . . can anyone tell what I did?
P.S. The correct guesser wins a prize
P.S.S. I retain the right to be biased as to what sort of prize to bestow, depending upon the identity of the prize winner :-)