One memorable anecdote I came across was about an animation artist who was in charge of animating the queen for a 3d chess game. Because he knew his manager's weakness he threw in a duck... Yes, a duck. Fully animated with sound effects and everything.
Sure enough, when he showed his work to his manager he said "It's perfect, but get rid of the duck."
So maybe the moral of this lesson is that when things are running 100% smoothly, it's wise to toss your micro-manager a bone by doing something intentionally a little wrong to give them something to meddle with. ;-)