In the satirical new movie “Mayhem,” out Friday, a virus is unleashed in an office building and causes the employees to go bonkers, acting out their wildest and most violent fantasies — using desk supplies.

Call it a fed-up 9-to-5er’s daydream.

“There’s been plenty of times when I’ve been, like, ‘You know, this stapler could make for a fantastic blunt-force-trauma object!’ ” director Joe Lynch tells The Post, with tongue in cheek.

Here are four office staples that the movie uses in badass ways.