Season 4 Episode 24 - The Leap
As his 31st birthday nears, an all-nighter to try to get business has Ted realizing he may need to pursue another career than architecture. Meanwhile, Marshall tries to get him up to a rooftop surprise party.
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Season 4 Episode 23 - As Fast As She Can
Ted is trying to find a new job, and when an old acquaintance tries to help nothing goes as planned. Barney tries to smooth talk his way out of a ticket.
Season 4 Episode 22 - Right Place Right Time
Ted explains to his future kids how a chance encounter with a former girlfriend changed his life. Barney makes the 200th notch in his bedpost.
Season 4 Episode 21 - The Three Days Rule
When Ted violates the 'three days rule' by continually texting with a girl he's just met, Barney and Marshall retaliate by impersonating her.
Season 4 Episode 20 - Mosbius Designs
Ted goes out on his own as an architect and hires an intern to help get things started, but the intern gets a little too close to others in the gang.
Season 4 Episode 19 - Murtaugh
Barney attempts 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.
Season 4 Episode 18 - Old King Clancy
Marshall and Barney lie to keep Ted from finding out the headquarters he'd been hired to design for GNB has been cancelled.
Season 4 Episode 17 - The Front Porch
Ted is shocked to learn that Lily is responsible for many of his breakups with ex-girlfriends—including Karen.
Season 4 Episode 16 - Sorry, Bro
Ted's college girlfriend reenters his life and leaves Marshall and Lily remembering how much they hated her—a fact they never revealed to Ted.
Season 4 Episode 15 - The Stinsons
When Barney inexplicably leaves MacLaren's, the gang thinks he has a girlfriend.