Production is in full swing on the Montreal set of X-Men: Days of Future Past, and today's photo takes us back to the 1970s. Director Bryan Singer sent out the latest photo from his Twitter account, showcasing James McAvoy as Professor Charles Xavier in complete 1970s attire. The filmmaker also used the hashtag #Serpico, in reference to the 1973 classic Serpico starring Al Pacino. While Professor X obviously won't be hitting up any disco clubs in his wheelchair, he definitely has the 70s look down to a T.