“Once James [Corden] steps in, you want to laugh at everything, but what makes what we’re doing funny is that we take it very seriously. So I always have to tell the dancers: ‘You approach the crosswalk like this is Broadway. Like this is the best thing you’ve ever done in your life.’ And that’s what makes it so funny, because people that are driving by are like, Why is there a full-blown production in the street?“