I knew a CFI who had just been hired in his first 'real' flying gig. He hops in the company A-36 to make his very first flight for the company. He starts ok but doesn't go anywhere. So he just adds full power. Plane moves forward one inch and stops. He goes to idle and the plane rolls back one inch. He did this several more times with the same results. Now he has a crowd watching. He shuts down and walks inside to 'use' the restroom. After a minute or two he comes back out, casually kicks the nose chock away and taxis out. But his gig was up because I had followed him into the restroom and all he did was comb his hair and wait an appropriate amount of time before heading out to the ramp. He was such an arrogant prick everyone was laughing when I said he simply ducked into the restroom as a ruse. Everyone makes mistakes, it's how one deals with them which is the measure of a man.