I was once asked to add a delay to the progress bar of an application that being developed. That application was consuming and processing data so quickly and efficiently that the progress bar would momentarily display on screen and then vanish. This had end users doubting whether their data was uploaded correctly. They reported this as a bug in the application. A small delay in progress bar loading helped to the point of having the application look much more efficient than it actually was at that point. That was one of the most surreal moments in my career 😂