ARLINGTON, Texas: In the Super Bowl of advertising, Justin Bieber replaced Ozzy Osbourne and Joan Rivers became a GoDaddy girl. But a pair of commercials by automakers took the early trophy for online buzz. A two-minute ad for Chrysler starring Eminem and a Volkswagen ad featuring a mini-Darth Vader that went viral before it even aired were two of the most talked-about spots during advertising's big night, Super Bowl XLV. Chrysler was one of nine automakers that took advantage of advertising's biggest and most expensive showcase, at $3 million for 30 seconds, to try to show they're back after two tough years for the industry.