Marshall: [on the phone] Listen, um, about Barney...
Honey: Oh, yeah. He's such a sweet guy.
[flashback to Barney and Honey together:]
Barney: Who's your daddy?
Honey: Oh... Who's your daddy?
Barney: [crying] I don't know.
[present:]
Honey: I guess he recently decided to get in touch with his dad. His mom gave him the guy's address.
[flashback:]
Barney: So I wrote him a letter. And I poured my heart out. And I gave him my number and I told him to call me. And he still hasn't called me.
Honey: Oh, honey.