Quote from Loretta in Showdown
Ted: Your dad is Bob Barker?
Barney: That's right
Lily: The host of The Price Is Right, Bob Barker?
Barney: That's Pops.
Barney: Yes, Robin?
Robin: Why in the world do you think Bob Barker is your father?
Barney: Uh, because my mother told me he was, that's why.
[flashback to Barney as a kid, watching The Price is Right:]
Young Barney: Mom, who's my dad? All the other kids at school know who their dad is. Who's mine?
Loretta: Oh, I don't know. That guy. [points to Barney on TV]