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Updated: Mon, 21 Oct 2013 17:15:00 GMT | By Colleen Last
How I Met Your Mother: before they were famous

Jason Segel

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In 1999, Jason featured in the cult TV series Freaks and Geeks alongside several young actors who would go on to bigger things. From left, Seth Rogan (Knocked Up), Linda Cardellini (ER, Mad Men), James Franco (127 Hours) and Busy Phillips (Cougar Town).