He would punch the nearest printer so it becomes stuck in his hand. Then, with his printer-powered knuckles, he would smash his computer and all its peripherals to pieces... and then go into every cubicle and do the same thing over and over, while swearing like a sailor, until the entire floor is thrashed. Finally, he would set the wreckage on fire and roll it all into a flaming Katamari of death... and then launch it through the biggest glass panel of the building with a dragon kick.
Then he would eat a burrito and forget everything that happened.
What would Nifflas do when he was on a rampage of epic destruction?