Quote from Barney in The Playbook
Lily: Don't you think you're kinda rushing back into this? Barney: Lily, since I started dating Robin, there's a certain thing haven't used as much as I would like to. It's... Kinda big, surprisingly heavy, kind of leathery, and it's black. Lily: Huh? Barney: This, my friends... Is the Playbook.