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. Meanwhile, Ted gets a new nickname from Barney after an unsuccessful hook-up.
Although he vowed to Robin and Marshall that he would never tell them, Ted finally tells his kids that at one time both Robin and Marshall used to smoke. In 2009, they both felt like they had good reason to do so. Marshall, only an occasional smoker, always said that each cigarette was his last. But when his old boss, the meanest man nicknamed Artillery Arthur, became his new boss, he thought he was going to be fired - again. So when Marshall found out that Arthur was a smoker, Marshall used it as a bonding mechanism to keep his job. Robin, at the time anchoring the ...
When Marshall finds out he's the "reacher" in his relationship with Lily and not the "settler," he considers pursuing a sexy and cool female coworker. Meanwhile, Ted finds out Robin is a drinking game for his architecture students.
Barney runs into problems when he displays his cell phone number during the Super Bowl, Ted asks Marshall and Lily to arrange a marriage for him, and Robin thinks that her co-anchor has asked her out on a date.
After the guys discover that Robin deliberately got Barney hooked up with an incompatible female writer, they find out that that they didn't realize that Robin hasn't been handling their breakup very well.
Ted angers Lily when he brings a random date to her birthday party, so she is forced to remind him of all the other random women he has brought along to important functions, only to discover that they weren't "the one."
As Robin contemplates moving in with her new boyfriend Don, Ted and Barney both decide that they want her back. Meanwhile, Marshall and Lily think they've revolutionized modern marriage when they begin sleeping in separate beds.
Marshall and Lily think they've spotted Barney's doppelganger, which means that they can start trying to have a baby, but it's really Barney in disguise. Meanwhile, Ted goes blonde and Robin considers taking an anchor job in Chicago.