Yahoo! Movies has made the trailer for Big Fan (starring Patton Oswalt) available. So click below to have the biggest laugh of the summer...

In a startling performance certain to be talked about, comedian Patton Oswalt (Ratatouille) makes his dramatic-lead debut as Paul Aufiero, an obsessive New York Giants fan whose chance encounter with his hero unexpectedly ends in violence.

Big Fan comes to theaters in 2009 from First Independent Features.