Quote from Barney in Swarley
Barney: You can keep going out with her, but you're gonna regret it. One time, I met a girl at this very bar. I saw that she had the crazy eyes but I ignored it. And then, sure enough. [flashback:] Lauren: Barney, can I ask you a question? Barney: Anything. Lauren: Would you like to have a threesome? Barney: Of course. Lauren: Great. It'll be you, me and Mr. Weasels. [holds up stuffed animal] [present:] Ted: So, did you do it? Barney: No. It ended up being just a twosome with the third one watching from a chair. Ted: Which one were you? Barney: I'd rather not say.