Robin: What the hell, Barney?
Barney: OK, it's a long story. As you know, my father had to leave my mom when I was a baby because he got hired as the host of The Price is Right.
Lily: Oh, yeah, it was a very good show.
Marshall: Bob Barker is your father.
[flashback to Barney in Loretta's hospital room:]
Barney: She had to raise my brother and me by herself. And her only wish was for her sons not to wind up alone, like she was. Then about seven years ago, she got really sick. It looked like she wasn't going to make it. So, I decided to make her wish come true.
Barney: Mom, this is Betty. We're engaged.