Monday was an excellent start to the week for AMC Entertainment (NYSE:AMC), with AMC stock during over 8% because of strong weekend box office sales. Fans of Despicable Me lined up for its fourth sequel, driving $230 million in gross box office sales worldwide and $122 million in the U.S. This success saw both ticket and merchandise sales at AMC theaters surge over the previous year.In the past weeks, AMC has been quite volatile. Currently, the company has a $1.6 billion market cap, and AMC stock is trading ...