How I Met Your Mother, Season 5

[Robin goes to MacLaren's after crashing the Robin 101 class. Ted comforts her]

Ted:
Look, all that stuff I told Barney, it was personal knowledge between you and me, and I'm sorry.

Robin:
Guess I'm impressed by how much you remembered.

Ted:
It's funny...when you date someone, you're taking one long course on who that person is, and when you break up, all of that stuff is useless. It's the emotional equivalent of an English degree. I guess I just like the idea of putting all my Robin Scherbatsky knowledge to good use, you know?

Robin:
Since you know me pretty well, am I fooling myself with this whole Barney thing?

Ted:
I don't know. I will say this though: I've seen Barney work hard to get women, and I've seen him work hard to get rid of women. I've never seen him work this hard to keep one around. I was gonna give him an A...well, B plus - Shin-Ya kinda screwed up a curve.