Swinging watches are for the films but there are many myths about Hypnosis. You may have heard that not everyone can be hypnotized, dependent on your understanding of hypnosis this may be true, no doubt not everyone would be able to take part in a stage hypnosis show where classic hypnotic phenomena such as amnesia, analgesia, anesthesia, positive and negative hallucinations are demonstrated but we all have the ability to enter trance states when we want to.
At some point or another in your life you will have experienced the phenomena associated with hypnosis. A classic example of experiencing a negative hallucination is when you have spent lots of time looking for something you've misplaced. You look everywhere for it, you check and check again, yet later it's found in a place that you'd checked and checked again.
There has likely been a time when you have cut yourself without realizing it, no pain being experienced, only when you notice the cut and focus on it do you begin to feel pain. Until you'd noticed it your mind was producing an effective anesthesia.
When you are hypnotized you are not unconscious. You will be aware of your surroundings, it is not the same as sleep. You may feel physically relaxed though it is not necessary, however your mind will become very focused.