Barney: So I was at the smoothie bar...
[flashback:]
Rhonda: What can I get you?
Barney: Oh, my God, Rhonda? It's Barney. Barney Stinson from Staten Island Boulevard.
Rhonda: Hey, Barney Stinson from Staten Island Boulevard. What can I get you?
[back:]
Barney: I can't believe she didn't remember me.
Ted: Why? Who is she?
Barney: That's Rhonda. I lost my virginity to her.