Certain subjects can pose unexpected compositional challenges. This might be to do with the arrangement of objects in the foreground, making it tricky to pick an ideal focal length, or objects in the scene impeding the perfect view of the subject.
One example of a setting that, on paper, should be relatively simple to shoot, but that often causes many photographers to throw their hands up in frustration, is a tall and thin subject. It might look impossible to take a bad image of a structure such as this lighthouse, but its tall, narrow design makes it a challenge to fit into a balanced composition.