Ok so he really didn't fall of the stage he sent out a stunt double. The Foo Fighters were playing in Sweden at the same place where Dave fell of the stage back in 2015 and broke his leg. Dave thought he would have some fun with the crowd.
Rather than keeping the crowd confuesed, the band kept playing after "Dave" fell of the stage! The crowd seemed stunned for a second until the real Dave came out on stage! If you need a good laugh, check out the video below!