Remember that commercial from a few years back where the fresh-faced office intern tells a co-worker that the printer is out of toner, is advised to "shake it", and then shakes the printer instead?
Despite this newbie mistake, it's pretty common knowledge among office environments that shaking the toner cartridge will help squeeze out a little more ink. Let's face it, copier and printer toner can be expensive. So why not do everything you can to save your company from undue print costs?