Investors could have used a large dose of Dramamine after the earnings release from RadioShack (OTC:RSHCQ) on Tuesday morning. Share-price movements were akin to a roller-coaster ride, with shares rising initially and then falling sharply thereafter. Motion sickness and Dramamine aside, the company presented a vast amount of information and, in the video below, Fool analyst Blake Bos gives you his four crucial story lines in the report. Be sure to pay close attention to the details, as it doesn't look like this Shack coaster is stopping anytime soon.