Post a replay of a time you fail, have seen people fail, or just tell us a tale of failure. My first one comes from a game I had a while ago. Where I actually blocked out a terran from his own base. Quite hilarious. ;D Take in mind this really is an old replay so my skills were pretty fail back then.
Not exactly high level of play but anyway. I failed by not seeing what my ovie saw, and then not realising soon enough what my drone was telling me But hey, things worked out in the end.