Ted's parents throw him for loop with big news; Barney scores big with Ted's Mom (no, not that big); Lily and Marshall tempt each other with calves and cleavage.
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.
Marshall and Lily keep thinking they see Barney's Doppleganger which, they agreed in the last episode, will be the Universe's sign that it's time to start trying to have a baby. Robin says goodbye to Don. Best of all, Ted goes blond!
