It’s already been a tough year for celebrity breakups, but thankfully Emily Blunt and John Krasinski still seem to be going strong. The former Office star was on The Tonight Show with Jimmy Fallon last night to talk about his new movie, The Quiet Place, and talk inevitably turned to Blunt, his co-star in the movie.

Krasinski talked about visiting Blunt in London while she was filming Mary Poppins. “That reaction means I married up,” Krasinski quipped when the audience cheered at the mention of Blunt’s name. “And don’t I know it.” 

When Fallon tried to assure the actor that he’s also a catch, Krasinski added, “They don’t have to tell me. The customs agent in London did.” Turns out, during one of his trips to the U.K. a customs agent had a hard time believing that he and Blunt were married. We’ll let him tell you the funny story himself below. It starts around the 2:30 minutes mark.