Once you spend enough time working at the same place, you start to get a feel for which tasks are actually needed to keep the company going and which ones are just there to appease the management.
And while they'd ideally be one and the same, we've all met someone who cares far more about controlling their employees than actually ensuring the day's work is done in a safe and effective manner.
Since this is something that so many of us deal with, it's always satisfying to hear about the ways that some employees manage to take some power back from those trying to lord over them.
As we can sometimes see, that's all the better when that worker is able to rig things up so their most annoying tasks are done automatically.