I remember chatting to my neighbour about his job. He was basically doing IT for a financial institution, and could be called 24/7. If shit happened at the weekend, he logged in from home, some 100 miles away from the office.
I had also, coincidentally, been to a presentation by the same company the previous week. Part of which was about their IT security, and "there are no external lines with access to the system".
I'm fairly sure that the authors of the presentation thought they were telling the truth :-)