Season 8: Episode 15 - P.S. I Love You

P.S. I Love You: When Ted insists that meeting his new love interest Jeannette is an act of destiny, Marshall and Lily claim she is simply a crazy stalker. Ted tries arguing his Dobler-Dahmer theory that there is a fine line between love and insanity to justify Jeannette’s behavior, which incites Lily to confess that she actually went to great lengths to meet Marshall in college. Meanwhile, Barney heads to Canada to track down the mystery man Robin was obsessed with as a teenager and uncovers a long-lost video recounting her breakdown from Robin Sparkles to angst-ridden grunge rocker Robin Daggers.