The duo runs into difficulty scoring on the train, but they succeed on their third attempt when they find a solution: getting drunk themselves, until Barney reveals that he and Quinn had hooked up that first night.
Lily and Marshall eventually end up bickering over the issue, but when they return home they decide, as impending parents, that they should work together as a team and no longer keep score.
Meanwhile, unknown to Barney, Quinn is revealed to be a dancer at the Lusty Leopard strip club and comments that he should have recognized her earlier due to his frequent visits.
[2] Alan Sepinwall of Hitfix.com said Robin's breakup with Kevin and Ted's admission of feelings for her is part of Victoria's warning at the end of "Ducky Tie" coming true.
[3] Ethan Alter of Television Without Pity gave the episode a C−, stating that he dreaded the consequences of Ted's confession to Robin for the rest of the season.