To celebrate 2013, YouTube invited some of its most popular contributors to star in a mashup of popular moments this year. Can you spot all the references?
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J.K. Rowling says the much-hated character Dolores Umbridge is based on a teacher to whom she took an instant dislike.
These songs are scary good!
Actor Paul Reubens is set to reprise his role as suited man-boy Pee-wee Herman in a new movie.