Marshall: Hey, baby.
Lily: Mmm-hmm?
Marshall: Not for nothing or nothing, but we'd still be doing this even if we hadn't seen Doppelganger Barney, right?
Lily: Oh, but we did see him, which means the universe, in all its infinite wisdom, is telling you to stick me and stick me real good.
Marshall: I can't. I can't, in good conscience, stick you.
Lily: I know what's bothering you.
Marshall: Really?
Lily: The cabbie just didn't look enough like Barney.
Marshall: Well, that's just not true.