Have you ever come to the point in a project that you look at it, it looks back at you, and you know, based merely on the malice of that look, that it's you or them? Yeah, we all have.
So, project in question was a simple hat that knit right up the first time. Ever hear someone looking at their youngest child and say "if they were my first, they would have been my last"? There I am.
Cast on the first time, figured out after two inches that I wanted eight less. Rip, cast on. Go about as far and notice a hole where I turned the work without noticing. Rip and cast on. Go an inch, do it again. Tink back to the problem and finish the round. Pick up the tail and knit with it.