Quote from Barney in The Over-Correction
Barney: Yes, it is. These are all the tricks I used to get women to sleep with me. Patrice: What do you mean, tricks? Barney: Like... "The Two Can Play at That Game." [title card: "The Two Can Play at That Game":] Woman: Can I help you? Barney: I'm sorry to be the one to tell you this, but... My wife is having an affair with your husband. I even found a list of every dirty way they've enjoyed each others' bodies. I wish there was some way we could get back at them. Woman: There is. We can kill them. [laughs] [Barney goes across the hall and knocks on another apartment:] Barney: I'm sorry to be the one to tell you this...