We head off in a direction hoping for a little nature spotting. We chat as we walk. Our walk becomes more about our conversation than the nature so we don't pay enough attention to the foliage as we pass.
A couple of hours go by and we realize that we are lost in the woods without the proper gear, any food, or any way to determine which way we should head. Because we didn't bother with a compass, we don' t know which direction we have been heading in. We are starting to get cold and hungry.
Too dramatic? Perhaps, a more realistic example then.