Spot the problem?

You may spot a few!

The one I'm referring to is the shadow in the very top right hand corner of this shot, taken on my phone... and caused, rather annoyingly, by my new phone case which I purchased on Christmas Eve and had been meaning to return ever since I realised the problem.

Moments after this was taken I switched my case for one that had a much better fit.
This shot was simply for demonstration purposes and I don't think I was the first person to return one!