Foo Fighters Turning the Tables On The Westboro Baptist Church

9/17/2011 5:15 AM PDT

Foo Fighters -- Turning the Tables on the Westboro Baptist Church

The Westboro Baptist Church came out to protest a Foo Fighters concert last night -- but the band was ready ... and came out to play an impromptu show just for them.

The Foo Fighters came out dressed in costumes and played a few songs -- from the back of a flatbed truck -- that mocked their ultra-conservative views.

As the old saying goes ... what's good for the bigot, is good for the gander.