The Hangover has enhanced its reputation as the sleeper hit of 2009 with the release of the DVD version of the movie. The relatively low-budget comedy that starred virtually unknown actors -- and received mediocre reviews when it debuted in theaters -- has in three weeks become the top-selling comedy DVD in history, Warner Bros. Home Entertainment said on Wednesday. Released on December 15, with just 16 days left in the year, the film wound up as the year's No. 2 best seller, behind the original Twilight. The Hangover had already taken the title as the highest-grossing R-rated comedy in theatrical history when it earned $467 million at the worldwide box office last year. In a related development, Video Business magazine, which focuses on the home video market, said Wednesday that it is closing down after 29 years effective at once. On its website, the publication describes itself as a "A Variety Group News Weekly."