This is an interesting one.
When I looked at this image on my computer and noticed that it looked out of focus, I was a little disappointed. I thought this was going to be a neat one when I took it. But then I looked closer.
Here's a 100% crop of the same image:
You can see here that the image is, in fact, in focus. Weird, huh?
This is a picture of a dome-shaped awning in the Old Port, taken from directly beneath it. I think what happened is that the shadow the "skeleton" of the awning casts on the translucent glass makes the image look out of focus. You can see above that the skeleton itself is quite sharp. A neat effect, if you ask me.