Neil Patrick Harris as Barney Stinson on 'How I Met Your Mother' in 2013 ...

Craig Thomas and Carter Bays opened up about how they landed on the show's five core stars Casting How I Met Your Mother led the show ... Then there was Barney Stinson, the philandering lothario ...

Casting How I Met Your Mother led the show in some unexpected ... Rebecca. Then there was Barney Stinson, the philandering lothario ultimately brought to life by Neil Patrick Harris.