What a scary situation! A police officer in Crawfordsville, Indiana was responding to a call of a masked man with a gun inside of a local bar. The thing the officer didn't know, though, is that the masked man was actually an actor, and the gun was a fake, as the filming of a movie happened to be taking place.
You can see in the video below that when the officer tells the actor (who he thinks is an actual robber/criminal with an actual gun) to drop the gun, the actor doesn't, but instead removes his mask. It's at this moment the officer fires his gun at the actor, missing him. After finally hearing that it's all due to movie filming, the officer sounds confused and then just tells the actor to get on his stomach so the situation can be assessed.
(Turns out the film and production crew never alerted the authorities of the filming, which is required.)