Sony's 'Superbad' made an impressive debut at the domestic box office this weekend, raking in a surprising $31.2 million from 2,948 theaters. The film, which was produced at a modest cost of $20 million, exceeded all expectations and marked the first time a summer movie released after August 15th has surpassed the $30 million mark. The audience for 'Superbad' was primarily composed of...