The orientation point you choose for the straighten tool in Adobe Lightroom can be too obvious in some cases.
You probably recognize the situations where you are doing your tone settings in Lightroom and suddenly…
Even thought you use the grids in your view finder of your camera (depending on the model you use of course) it will happen that sometimes you image will be tilted. Just because you didn’t pay enough attention to it.
This is why the straighten tool in Lightroom is one of my favorites.