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British boy wizard Harry Potter conjured his magic at box offices again, as the sixth film in the highly popular movie series earned a record $22.2 million at Wednesday midnight showings in the United States. "Harry Potter and the Half Blood prince" from Warner Bros. beat the old record for Wednesday midnight screenings of $18.5 million held by 2008 Batman movie "The dark knight". The debut protends a huge and potentially record breaking number for a single day gross and best first five day gross. The highest one day U.S box office record belongs to "The Dark Knight ", which debuted on a Wednesday last summer to $67.1 million and went on to $203.7 million in its first five days. It earned $1 billion worldwide.