" The phone had a lock on the dial. Only the teachers had the key. But that didn’t matter, because we learned that you could dial a phone (any phone) by tapping out the phone number on the switch hook. I was a drummer, so I had pretty good timing and reflexes. I could dial that modem, with the lock in place, in less than 10 seconds. "

― Robert C. Martin , The Clean Coder: A Code of Conduct for Professional Programmers