A couple of weeks ago we had some pretty thick fog here in Central Florida and this is a shot of a "Slow Speed, Manatee Zone" sign in the middle of the Indian River. As you can see or can't see, where the water ends and the horizon begins, just the sign and it's reflection.
Canon 7D w/ 70-200mm @70mm ISO400 1/3200sec@f/4. Processed in Lightroom 4