Watch How I Met Your Mother Season 4 Episode 17 online via TV Fanatic with over 7 options to watch the How I Met Your Mother S4E17 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, Hulu Plus, and Verizon On Demand.
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When Ted's girlfriend, Karen (Laura Prepon), discovers Robin's earring in his bed, Ted finds out it was actually Lily that planted it there and she's been sabotaging his relationships for years.