As his 31st birthday nears, an all-nighter to try to get business has Ted realizing he may need to pursue a career other than architecture. Meanwhile, Marshall tries to get him up to a rooftop surprise party.
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Ted continues trying to land a client for Mosbius Designs, and when Tony tries to help, nothing goes as planned, for either of them. Barney tries to smooth talk his way out of a ticket.
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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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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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The gang learns a new strategy to get their dates to sleep with them after Ted walks in on Robin’s date sitting naked on the couch. Check out "How I Met Your Mother" photos and extras!
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Stella finally gives Ted an answer to his marriage proposal. And Barney confesses to Lily that he’s in love with Robin. Check out "How I Met Your Mother" photos and extras!
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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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