Barney/Barry learns that his sexual prowess is missing a first act; The gang decides to join a gym together with hilarious results; Lily owns this episode on jokes.
In the most brilliantly layered episode of TV, perhaps EVER, we learn how the Platinum Rule came about via three stories over three years. Barney with Wendy the Waitress, Lily and Marshall with some neighbors, and Robin with a coworker.
Barney is being stalked by a past sex partner who is salting his game all over town. The gang holds their own march madness bracket with the most likely candidates.
The whole gang heads to Cleveland for Punchy's wedding where the crowd eagerly anticipates Ted's emotional toast. Lily tries to keep her pregnancy a secret and Robin wonders if she's really done with Barney.
In a clever ruse, Barney and Quinn set up the gang to believe they've ruined their relationship. Robin and Ted squable over Quinns apartment and Marshall retells ill advised sex stories about him and Lily.