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It's Ted's 31st birthday; Barney gets ready to profess his love to Robin; and Marshall wants to take the leap.
Tony tries to make things right with Ted after stealing Stella from him; Barney tries to talk his way out of a speeding ticket
Ted explains how a series of random events led him to meet to a pivotal woman while he had a yellow umbrella.
When Ted violates the three day rule by texting a girl he just met, Barney and Marshall pretend to be the girl to mess with him.
Ted starts his own architecture firm and hires an intern to get things started, but the intern gets too close with members of the gang.
When Barney finds out that Ted made a list of things he thinks the gang is too old to do, Barney attempts to complete the whole list in 24 hours to prove them wrong.
Ted is shocked when he finds out that he was fired from building the new GNB headquarters months ago and that Barney and Marshall went through great lengths to hide it from him.
When Ted's girlfriend, Karen (Laura Prepon), discovers Robin's earring in his bed, Ted finds out it was actually Lily that planted it there and she's been sabotaging his relationships for years.
Ted's old college girlfriend Karen (Laura Prepon) comes back into Ted's life, making Marshall and Lily remember just how much they hated her, something they never told Ted.
The gang meets Barney's wife and kid they never knew existed. Of course, we know it's all just a show for his mother.
