The writer of this USA Today article about popular gift items used boldfaced keywords at the start of paragraphs as a way to break up the text. Nice move, logically and graphically. Problem is, a letter from one of the words in regular body type apparently grew jealous and, in a desperate attempt to make more of itself, sneaked its way into a bold new world.
I caught you, S. You have no right to be so bold. Why are you trying to stand out? Nothing about you screams importance. You are not, for instance, the red S emblazoned on Superman's chest. I cannot emphasize enough that you have no need for emphasis. Stay regular. That dark, heavy type doesn't suit you.