Ted: Who else?
Lily: Remember that weird sci-fi girl who wanted you to propose after, like, two months? You barely even liked her, but you were still thinking about it, so...
[flashback to Ted and Marshall, dressed as Luke Skywalker and Chewbacca, in line outside the movie theater. A woman in a Darth Vader costume approaches them.]
Lily: Listen, Ted, you're great, and this is so difficult, but I think we're looking for different things. So, live long and prosper. Or whatever.
[present:]
Ted: That was you? This is insane!