I once attended a workshop where the presenter asked everyone present to stretch his/her arms up and reach as high as possible. Of course everyone did and there were a few giggles and smiles. Then the presenter asked everyone, “I know you did what you thought was your best, but do you think you could reach just a little higher?” The crowd seemed to focus a little more, people looked at one another and sized up someone they could compete against. Then on cue the crowd strained, grunted, and coughed but did in fact reach further than the first attempt.