Quote from Ted in Robin 101
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.