With How I Met Your Mother wrapping after nine and 200-plus episodes, one of the leads took to a CBS sister show to talk about. Cobie Smulders is on Late Show With David Letterman tonight to talk about the Big Finale, and during their chat she reminds the host that her show’s co-creators started as writers on his show. Letterman: “They are – help me out here…” Smulders:  “Craig Thomas and Carter Bays, yeah.” Here’s a clip: