Lily: I think 's nice that Ted knows you that well.
Robin: Ah, well, too bad it's next to a page entitled...
[flashback to Ted's classroom:]
Ted: "Robin Scherbatsky's Surprising Erogenous Zones." Right knee, ticklish. Left knee...
[flashback to Ted and Robin in bed in 2006:]
Ted: Does lefty like that?
Robin: [groans]
[back:]
Ted: Oh, yeah. Lefty like that.
Barney: I can't believe I'm taking sexual advice from Ted Mosby. That's like taking fashion advice from... well, Ted Mosby.