Future Ted: [v.o.] Kids, you remember my first day with Robin. Well, here's the thing, normal people, you know, people who aren't your dad, usually take longer to say "I love you." Robin went through the usual stages.
[flashback to Ted, Robin and Barney in the apartment:]
Robin: Spider! Spider!
Barney: I left something in the hallway.
Ted: Where?
Robin: Right there.
Ted: Got it.
[Ted kisses Robin. Barney returns]
Future Ted: First there's the moment when you think you think it.
Ted: Whoa, still alive.
Future Ted: There's the moment you think you know it.
[flashback to Ted comforting Robin in bed:]
Robin: Oh, you don't want to kiss me, you'll get sick.
[two days later, Ted is sick:]
Ted: Totally worth it.
Future Ted: There's the moment where you know you know it, but you can't yet say it.
Ted: All right, it's getting to be that time. I'll talk to you tomorrow?
Robin: Good night.
Ted: Good night.
Robin: Wait, Ted?
Ted: Yeah?
Robin: Good night.
[The next morning, Ted walks into Robin's apartment as she's on the phone:]
Robin: Well, great, I'll see you then. Bye, sweetie. [to Ted] Hey. Guess what? My sister Katie is coming to visit next weekend. She gets in on Thursday.
Ted: That's awesome. You know what I'm going to do? I'm going to take off work Friday. We're gonna take her to the Empire State Building.
Robin: Really? You'd do that?
Ted: Of course. Everyone should see the Empire State Building.
Future Ted: And then there's the moment where you know you know it, and you can't keep it in any longer.
Robin: Ted.
Ted: Yeah?
Robin: Falafel.