PEDANT ALERT:When I took my motorcycle test that was how obvious the instructor was when he hid behind a tree then jumped out on me to test my emergency stop. It was summer though so he wasn't dressed as a Santa, obviously.
I was riding a Honda C70 and that test gave me the right to jump on any motorbike, even a 1200 cc Japasaki if I had wanted.
When I took my motorcycle test that was how obvious the instructor was when he hid behind a tree then jumped out on me to test my emergency stop.
PEDANT ALERT:
It was the examiner who jumped out in front of you, not an instructor. Examiners conduct driving tests, instructors don't.
Just so's you know.