DB, the chances are that your examiner will be from a choice of one!! And I doubt he'd do that to you!!!
However, I had it done to to me during my PPL. It did the necessary .... my sphincter muscle thankfully still operational!!! I would not have believed, at the time, how disorienting and scary it was and I would rather have been shown it than to encounter cloud, thinking I could do it, when I was flying solo or, worse still, with a passenger!!
Cheers
Whirls