Laziness
In the eighties I got a call from a software guy working for me at the French site of CERN (North Area) saying that he could not work because his terminal was dead. My obvious question was whether it was plugged in and he assured me it was. Reluctantly, I got a CERN car to go from the Swiss Meyrin site to the North Area to investigate and found the guy in the barracks at ease drinking coffee. I followed the power line under the floor tiles and discovered it was disconnected there because someone had needed a power socket temporarily. So after the fix he had to start working again! The guy was fired a year later for other reasons.