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John Lithgow on Playing Barney's Dad on 'How I Met Your Mother' -- Plus an Exclusive Clip
Monday night is a landmark one for fans of 'How I Met Your Mother,' as Barney Stinson (played by the ever-game Neil Patrick Harris ) finally comes face to face with his father.Following The Big Bang Theory ‘s move to Thursdays and the uncertain future of Two and a Half Men , the dominance of CBS’ Monday comedy block is in jeopardy.

