Barney: I'm telling you, you should use the architect angle with the ladies.
Ted: Okay, first of all, I have a girlfriend. Second, the architect angle doesn't even work on her. And, third, I can't imagine that working on anyone ever.
Barney: That's 'cause you're always like... [flatly] "Ted Mosby, architect". If it were me, I'd be like... [boasting] "Ted Mosby, architect". Anything sounds impressive when it's said with the right attitude.

[As Anna reads the letter that Barney left behind:]
Barney: "Dear Resident... The time we spent together, however long it was, meant the world to me. I would love to see you again, but unfortunately, I cannot. You see, I am a ghost. I can't only materialize once every decade on the anniversary of my death. I chose to spend my one day among the living with you, sweet resident. Perhaps we will meet again in another decade, provided you keep your figure. Until then, all my love from the beyond. Barney."
Anna: Barney? Who the hell is Barney?

[flashback:]
Barney: Sorry, I forgot my binocs for Foxy Boxing. Whoo, looks like things just got a little foxier right here.
Ted: Yes, they did. And you're just in time. Girls, I got to go, but I'm leaving you in very good, if slightly sullied hands.
Anna: Don't go. We don't even know your name to look out for your buildings.
Barney: Yeah, stay. [mouths "go"]
Ted: Excuse us for one second. [to Barney] Okay, you were right. The architect thing totally works. But I've got a girlfriend and I've got to get back to work. This project is getting harder and harder.
Barney: Yeah, you did.
Ted: Yeah, had to. See ya. [leaves]
Barney: [to Paula] Sorry, my, uh... intern had to leave.
Anna: Oh, well, that's too bad. I'm Anna, by the way.
Barney: Ted Mosby, Architect.