[flashback:]
Barney: Robin, there's no good way to say this. I made a huge mistake. I can't go through with the wedding.
Robin: What?
Barney: [choked up] I'm so sorry. I-I just... I had to tell you before it was too late.
Robin: Oh, my god, you're serious.
Barney: Yeah. And since this is my apartment, I think that you should move out.
Robin: Fine.
[Barney opens the red suitcase that's on the bed]
Barney: Puppies!
[later at MacLaren's:]
Barney: I know. Great prank, right?
Marshall: That is awful.
Lily: You're a frickin' weirdo.
Ted: [dressed as Liberace] Such a weirdo. Careful, watch the robe.