When Lily and Marshall realize that Robin and Barney are the perfect double-date friends, they try too hard to impress and come on too strong, forcing Barney and Robin to try to break up with them
Ted realizes his blind date is the same girl he had a blind date with seven years prior. Meanwhile, the rest of the gang discover a Lily look-alike at a strip club.
When Marshall and the gang finds out that Barney and Robin are hesitant to define their relationship, Lily forces them to confront their biggest fear. Meanwhile, Ted is anxious about teaching his first lecture at Columbia.
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.