Here's how to knock 'em dead at prom: Arrive at the dance in a coffin. Alexandrea Clark was the talk of her Georgia high school after showing up a casket. Alexandrea aspires to be a funeral director or mortician someday. Megan Flaherty of New Jersey has the same dream. Remember last year when she arrived at prom in a hearse? InsideEdition.com's Leigh Scheps (http://twitter.com/LeighTVReporter) has more.