Matt Damon will need to watch his back on set after a fan won a walk-on role and threatened to "attack" the star. San Diego, California businessman Jeff Jacobs bid $50,000 at a weekend auction, so his wife could play a part in an unnamed Damon project.

Jacob's wife told the Las Vegas Journal-Review she planned to "attack him" when asked what she'd do upon meeting her movie hero.

The auction was held as part of former tennis ace Andre Agassi's charity weekend in Sin City. Other top items included soccer lessons from David Beckham ($60,000), and the chance to vacation with Agassi and his wife Steffi Graf in Georgia.

Image © PRN / PR Photos

(This news article provided by World Entertainment News Network)