Aperture Science was filled to the brim with jobs and opportunities that most people would consider either suicidal or, to quote the leaving essay of a previous employee, "pants-on-head retarded". Many of these jobs were dangerous beyond all belief, such as being the poor bastard that had to clean out the Aperture Science Osteo-Seperation Machine. However, it could be argued that the poor unfortunate souls assigned these jobs at least had some solace. It would never be boring.
There was one job, one specific task that everyone dreaded: Patrolling the chambers of comatose test subjects . The scientists refused to do it, they were busy with extremely important research. The interns refused to do it, they were busy playing table hockey with the scientists. Even the machines, the automatons barely capable of comprehending what boredom was, didn't want to do it, as it made them feel 'unimportant'. The route was simple, the task was dull and it was so easy even a moron could perform it exceptionally well.
It was perfect.