Agreed, and after you've worked with them for a bit you can start to predict where they are going to fail, and do something silly like delete your code base, or

Agreed, and after you've worked with them for a bit you can start to predict where they are going to fail, and do something silly like delete your code base, or have no trouble, and succeed, and add that feature you were after. A good code review and edit to remove the excess verbosity, and you got a feature done real fast. Ask it for something at or above its limit then the code is very difficult to debug, difficult to understand has potentially misleading comments, and more. Knowing how to work with these overly confident coworkers is definitely a skill. I feel it varies from significantly from model to model as well. Its often difficult to task other programmers with tasks at or above their limits too.