Robin: Good night, Ted. [Ted and Robin shake hands]
Ted: And I'm a good hand shaker.
Robin: That's a pretty great hand shake. [long look into Ted's eyes]
[cut to:]
Ted: And that was it, probably never see her again. [silence] What?
Marshall: That was the signal!
Lily: That long lingering handshake. You should've kissed her!
Barney: There's no such thing as the signal. But yeah, that was the signal.
Ranjit: Signal.