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 one of the most brilliant runs of HIMYM, Karen, Ted's college girlfriend moves to New York and is brilliant in all her pretentious glory. Also, Barney is tickled by Marshall forgetting to bring pants to work.
At his father's gravesite, Marshall recaps adventures of NYE, where Lily informs Mickey about being pregnant, Ted and Barney open Puzzles in Ted's apartment and Robin gets an on-air position thanks to another Sandy mishap.
Barney lives vicariously through Ted's relationship with a 20 y/o. Robin is stung by the effects of wearing her engagement ring. Lily and Marshall find romance in a leather wrist cuff and mom jeans.