According to this recent article in Scientific American, the three types are 1) the Dunning-Kruger type, in which the protagonist vastly overestimates his skill or knowledge, 2) impulsive mistakes, and 3) mistakes of inattention.  I've never made any of those, have you?

How a 2-Minute Story Helps You Lead
Stew Friedman: Better Leader, Richer Life | 3:53 PM Tuesday August 4, 2009
http://blogs.harvardbusiness.org/friedman/2009/08/how-a-2minute-story-can-help-y.html
( textCollapse )

http://www.huffingtonpost.com/linda-stone/is-it-time-to-retire-the_b_106624.html
By Linda Stone | Posted June 11, 2008
Nice article on the choice and execution of your life's content.
Time for me to turn off this computer for a while.

Leading doc says many adults with ADHD aren't getting diagnosed or treated:
http://news.bbc.co.uk/2/hi/health/6225615.stm

And I thought I was just sinister:
http://news.bbc.co.uk/2/hi/health/4297391.stm