[2] Barney decides to attempt a "perfect week", defined as having sex with seven women in seven days without a single rejection.
On the sixth night, Lily utters the phrase "perfect week", jinxing Barney.
The next night, Lily is so confident that Barney will succeed in seducing Christy at the bar, she says "there's no such thing as a jinx."
Then Nick Swisher, a member of the 2009 World Champion New York Yankees, walks through the door.
Back at the bar, the gang commemorates Barney's week by retiring the tie he wore on the seventh day.