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You could be right, but here's more from the originating site where they try to argue otherwise: http://www.randominc.net/spinninglady/

it can't be true since when 2 or more people are looking it at the same time and place they will give you different answers... try it with your family ;)

Just be safe I check the interval of the switch, it happens roughly every 1min 15 secs. The way i notice it is to watch the direction that the tip of the ponytail is traveling.

Good diagnosis, sorry; i wanted to upvote your comment; guess i haven't had enough coffee yet and hit the wrong button :(.