I'm gonna go out on a limb and guess that this is the first time two knighted cultural figures have played The Newlywed Game -- a version of that wince (and nostalgia) -inducing game show that ran from the 1960s through the 1990s. Although Stewart and McKellen aren't married, they know each other plenty well. They've worked together on stage (in a production of Waiting for Godot) and in film (they'll be appearing together in an upcoming X-Men movie.) And suffice it to say, they've formed a tight friendship. When Stewart married Sunny Ozell last year, McKellen officiated at the wedding ceremony.
This little bit took place at a BuzzFeed Brews event back in February. You can watch their full 48 minute appearance here. Also find the two in a deeper conversation recorded at the Screen Actors Guild Foundation just last month.