It's funny how you can spend your time around the office feeling confident, on top of things, above your menial tasks, overworked and underpaid. And then suddenly you have a review coming up and you can't think of a single good thing about your performance. You become embroiled in all sorts of self destructive paranoia. Suddenly you're worried - have I been borrowing from petty cash too often? Using too much company postage for personal mail? Leaving a messy work area at the end of the day? Spending too much time on the internet instead of being productive? It's those damn self-evaluations that get you every time.