Doctor's office. Marshall's looking at a pamphlet, which is a countdown cheater by having both numbers "43" and "42" on it. He insists there's no way this doctor's Barney until Dr. Stangel walks in. He pulls on Stangel's beard, and then believes he's real. There's a "41" race-car picture on the wall behind Dr. Stangel. Lily's still not buying it, so they summon Barney. He stands and looks at Dr. Stangel, and says it's like looking into a poorly dressed mirror. He makes faces, and Dr. Stangel makes him leave -- and does not let him take the vagina model. Barney leaves and Lily's unconvinced again. She needs to see them both at once to be convinced he hasn't pulled a crazy switch. They finish up the appointment with Barney headphoned and goggled up, with paper blocking the sides of his goggles, even. He can't hear or see and is talking to the wall, thinking it's Lily, and taking pictures. Lily asks Dr. Stangel if they can leave him in here, and Dr. Stangel's cool with it. He's leaving for the day.
Saget!Ted takes us to Robin's new job at World Wide News, then to her coming home on her first day. Ted, reading a book about "40" greatest landmarks, asks her how her day was. She raspberries (which will get old soon) with a thumbs-down. That flashes us back to her work again, where she's being introduced as she stands in front of a door labeled "39." Then she meets the new host, played by Alyson Hannigan's real-life husband Alexis Denisof, back in his role as douchebag Sandy Rivers. Ted reminds us that he's Robin's old co-host and Ted's old nemesis for offering to have sex with Robin back in the day. Sandy remembers Robin and tells the entire newsroom that they've had sex. Everyone, including a woman holding up a newspaper weather page with "38" degrees on it, gasps. Back at the apartment, Ted does, too. But Robin swears she didn't have sex with Sandy. And she can't believe it's her first day and she's already slept with the host of the show. Ted asks if she was eventually planning on that. She says not now that she knows it's Sandy (obviously!), and storms off.
Lily's all smiles on the couch reading a magazine with "37" recipes when Marshall comes home. She fills him in on their two phone messages: His dad called to see if he has any sixes (Marshall explains they're playing Go Fish over the phone -- which I maintain is impossible), and the doctor called and she's extremely fertile. Marshall's about to call and tell his dad the good news -- we even cut to his dad working in his shop with a beer can that says "36" on it -- but then he realizes he might be the problem, so doesn't call.