Scissors vs. a gun? Not exactly a fair fight.

WASHINGTON — Is your workplace getting shot up by a crazed gunman?

No problem — just grab a pair of scissors and fight back!

That’s some of the helpful advice in a new instructional video from the Department of Homeland Security that was posted on the agency’s Web site just a month after the massacre at Sandy Hook Elementary School in Connecticut.

“If you are caught out in the open and cannot conceal yourself or take cover, you might consider trying to overpower the shooter with whatever means are available,” says the narrator in the video, which shows an office worker pulling scissors out of a desk drawer.