How I Met Your Mother's Neil Patrick Harris, Cobie Smulders, Jason Segel, Josh Radnor, and Allison Hannigan tham gia the show's creators, Carter Bays and Craig Thomas, and Pay Fryman, the show's Director to celebrate 100 episodes.
Take a look back at the journey that Barney and Robin have been on, will they ever get together? Watch 'How I Met Your Mother' Mondays at 8:30 to find out!
