5 “Where did that line come from (and how do I get rid of it)?”
Have you ever typed a few dashes in between paragraphs (as a placeholder or whatever), hit enter, and somehow wound up with a line all the way across the page that you can't get rid of, no matter how many times you hit the Delete key?
Infuriating, isn't it? But I'm here to tell you: It's both fixable and preventable. (Yay!)