Most contract jobs fade pretty quickly in memory after the work is done, but some you remember for the rest of your life. This is one of the latter variety.This happened long ago, at a (fair sized) company that shall remain nameless. The software was a chunk of code that had been maintained by a single guy that had been fired recently and was a core component of a commercial system.So far nothing unusual, companies tend to find out that they have a piece of critical knowledge in one head all the time, usually if something happens to or with such a person there is a mild panic, some days of fra...