I present you with the taxonomy of terrible software developers, the ecosystem of software critters and creatures who add a whole new meaning to the concept of “defensive programming.” At one point or another, every programmer exists as at least one of these archetypes – the good ones see these bad habits in themselves and work to fix them over time. The bad ones… simply are.

http://www.aaronstannard.com/the-taxonomy-of-terrible-programmers/