Barney: Okay, well, I guess now is as good a time as any. In keeping with tonight's award show motif, I'd like to announce this evening's big twist ending! Vampire Lou, would you do the honors?
Vampire Lou: "Mary's not really a prostitute."
Marshall: What?
Barney: That's all, Vampire Lou. Nicely done.
Marshall: So she's not...?
Barney: No. Mary's just a paralegal who lives in my building. Oh, ha-ha! And here's the best part, she has no idea that Ted thinks she's a hooker. [laughs] Oh, come on. If you don't laugh, it just seems mean.