Paul McCartney played the first of two shows at London’s O2 arena last night, and he had a few surprises in store for the audience. One of them was the live debut of “Temporary Secretary,” one of the singles from his 1980 album McCartney II. And another was Dave Grohl himself, who came out during McCartney’s first encore to duet and play along with “I Saw Her Standing There.” Watch videos of both below.