The X-Men franchise seems to have a way of making best friends out of its actors. It's common knowledge that Sirs Patrick Stewart and Ian McKellen are inseparable, but here's evidence that the younger Days of Future Past crowd are besties as well. In this video from BBC's The Graham Norton Show, theater vets Hugh Jackman and James McAvoy dance with new buddy Michael Fassbender to the summer hit of 2013 — forming the world's most dapper boy band.