Rock star legends Gene Simmons from KISS and ex-member David Lee Roth from Van Halen were virtually at each other's throats, which the fans saw.

The most memorable part of episode 5 on "The X Factor USA" was a surprise appearance by a legendary rock star that has always had the "x factor" of his own. Gene Simmons, the most famous member of the iconic 70's rock band KISS, attended "The X Factor USA" season 2 auditions in San Francisco to support his daughter, Sophie Tweed-Simmons. Tweed-Simmons told the show's cameras in the pre-audition tape she had hoped the judges wouldn't learn who her parents are because wanted to be her "own person." Despite the declaration, the 19-year-old confirmed who her dad is unexpectedly.

Season two of "X-Factor" is now down to its final week in a grueling audition process. The Fox hit show has already graced its viewers with a slew of notable moments and talent combinations. The newest judges to "The X Factor" team, Britney Spears and Demi Lovato, have proven themselves as reputable additions to the program, as their personalities are clearly clicking with fans. Collectively, both the Wednesday and Thursday editions of the show are said to be featuring some of the top auditions of 2012.