Barney: It's all in here. Everything from basic moves like "the don't drink that."
[flashback to Barney at MacLaren's rushing over to a woman at the bar:]
Barney: Whoa, don't drink that. I saw some guy slip something in there.
Woman: What? Who?
Barney: Uh, that guy. [points to Ted, at the other end of the bar, who is then tackled by the barman]
Woman: Thank you.
[Barney winks to camera]