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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