Well, I get this question all the time and many of the people become really shocked when they learn they can be. For starters, you have probably been hypnotized or in trance serveral times in the last month. Maybe you went to a movie, drove on a long road that appeared to be only a few mintues, day dreamed, listened to a lecture or other activity that naturally caused you to drift.  Many times you may say you never drift but find it stange when you have a page of notes and your friend has over ten, what happened.

You day dreamed or in the technical terms went in trance and may actually have learned more then if you were there.

Getting back to the real question is why? The reason why my clients have at first not been able to be hypnotized is that they lacked the willingness to want to let go. They were afraid of being controlled or what might happen and decided consciously and some unconsciously to put up a mental block to prevent them from going into trance. If you can focus your mind on one thought, which all of us do in some form or other, then you can be hypnotized if you desire it.