Ted explains to his future kids how a series of unrelated events led to a chance encounter with a former girlfriend. Barney makes the 200th notch in his bedpost. Marshall goes overboard when he discovers GNB has a department that can make him charts and graphs.
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Barney tries to complete in, a single day, all the tasks from a list Ted made to prove the gang’s not too old to do them. Meanwhile, he challenges Ted to complete a list of things they're too young to do yet.
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Ted goes out on his own as an architect and hires an intern to help get things started, but all he helps himself to is Robin. Meanwhile, news of impending layoffs at GNB has Marshall looking for a schtick to make himself indispensable to the company.
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Lily comes up with a perfect plan to break up the relationship between Barney and Robin when they have a rough patch, but she needs help from Robin’s famous friend, Alan Thicke, in order to make it work. Ted and Marshall turn to Lily to break up Barney and Robin when it's clear they're miserable...
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Ted is shocked to learn that Lily is responsible for many of his breakups with ex-girlfriends, including Karen. Meanwhile, Marshall defends his wearing of a nightgown to bed.
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Marshall and Barney lie to keep Ted from finding out the headquarters he’d been hired to design for GNB has been cancelled. And the gang tries to decifer the story of a celebrity encounter Robin once had.
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Lily comes up with a perfect plan to break up the relationship between Barney and Robin when they have a rough patch, but she needs help from Robin’s famous friend, Alan Thicke, in order to make it work. Ted and Marshall turn to Lily to break up Barney and Robin when it's clear they're miserable...
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Lily comes up with a perfect plan to break up the relationship between Barney and Robin when they have a rough patch, but she needs help from Robin’s famous friend, Alan Thicke, in order to make it work. Ted and Marshall turn to Lily to break up Barney and Robin when it's clear they're miserable...
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Ted’s college girlfriend reenters his life and leaves Marshall and Lily remembering how much they hated her. Meanwhile, Barney tries to steer the storytelling towards the fact that Marshall forgot his pants at work that day.
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