Future Ted: [v.o.] But then a funny thing happened. Over the next couple weeks, Barney was thoughtful, considerate, sweet. In short, the perfect boyfriend. Which, to Robin, meant only one thing.
Robin: He's cheating on me.
Lily: What?!
Robin: Why else would he buy me flowers? He's gettin' some on the side.
Lily: Oh, come on, Robin. Barney's not the type of guy who would... Go on.