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Watch How I Met Your Mother Season 4 Episode 19 online via TV Fanatic with over 3 options to watch the How I Met Your Mother S4E19 full episode. Affiliates with free and paid streaming include Amazon, iTunes, and Amazon Prime.
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When Barney finds out that Ted made a list of things he thinks the gang is too old to do, Barney attempts to complete the whole list in 24 hours to prove them wrong.