Afro Samurai
Don't even try to act like you didn't watch it, motherfucker. It was better than I was expecting. You get to hear Samuel L. Jackson rant as Ninja Ninja, plus they had some nice fighting. And I'm always impressed when the animators/choreographers/whoever actually get the moves right, even if they are insanely exagerated.
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Also, I bought and Afro Samurai shirt before even watching the show. Now I don't regret it!