You have probably seen a "spinning" woman illusion online somewhere before (go to the link if you haven't). They say that if you see her spinning clockwise, then you're right-handed, and if you see her spinning counter-clockwise, then you are left-handed. That is not necessarily true. Some people can see her spinning both ways, and some can only see her spinning in one way. This blog/article has asked over 1,600 readers to answer what they see. Roughly 2/3 of the people see her as spinning clockwise, and the rest, counter-clockwise, and 2/3 of them can see the reverse spinning direction, as well. This may have been because it is less natural to see her spinning counter-clockwise, and therefore, people who first saw her spinning in the "natural" way (clockwise), is less likely to be able to reverse her spinning direction.
This blog also says that those people who can reverse the spinning woman are significantly more likely to be able to see 3D Magic Eye illusions (see link), and that there might be a relationship between how much time you spend gaming and your ability to perceive the illusions. I have never been able to see a magic eye illusion and had not really been able to reverse the spinning woman all my life when everyone around me could. I'm hoping that it is mainly because I do not play games, not any other reasons.