“The Pre-Nup” — When Barney (Neil Patrick Harris, center) designs an extensive pre-nup, the guys take note and propose their own relationship amendments to their significant others. Meanwhile, Quinn (Becki Newton, left center) is outraged and draws up a pre-nup of her own, which causes friction between the sexes, on HOW I MET YOUR MOTHER, Monday, Oct. 1 (8:00-8:30 PM, ET/PT) on the CBS Television Network. Photo: Monty Brinton/CBS © 2012 CBS Broadcasting, Inc. All Rights Reserved.