We're not going to let a couple of losers get in the way of winning are we? Of course not! But it is that time of year when we take a look in the mirror and acknowledge our worst mistakes. In the spirit of transparency and good score-keeping, we present David's worst stock picks of the last 3 years, one lesson tagged to each. Thanks to LinkedIn for supporting The Motley Fool. Go to linkedin.com/fool and get $50 off your first job post.