Season 5, Episode 16 (Hooked): Guest starring Carrie Underwood. When the gang tries to convince Ted that he is being strung along by Tiffany, they reflect on the relationships in which each of them had been in the same situation.
Season 5, Episode 15 (Rabbit or Duck): Lily and Marshall investigate the girls Barney has dated in order to see if any of them could be Ted's future wife. Meanwhile, Robin is invited to a party by an obnoxious colleague.
Season 5, Episode 14 (The Perfect Week): When Barney is about to complete the perfect week - landing seven different girls in seven days - the gang roots him on in order to forget about their own miserable week.
Season 5, Episode 13 (Jenkins): Featuring guest star Amanda Peet (as Jenkins). When Marshall's co-worker kisses him, he can't get Lily to believe it happened. Robin discovers she's the subject of a drinking game.
Season 5, Episode 12 (Girls Vs. Suits). Barney chooses between wearing suits and sleeping with a sexy bartender. Meanwhile, Ted dates a student from Columbia and reveals she's the roommate of his future wife.
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