The magnetic fingers experiment is used as a pretest by hypnotist to test for suggestibility of a subject. It is also used as a convincer as being hypnotic phenomenon.
The hypnotist asks subject to clasp their hands together with fingers interlocked. Then the subject is asked to extend their two index fingers upward, holding them about an inch to an inch and a half apart. The subject is ask to concentrated on the space between their index fingers, while the hypnotist suggest that their fingers are magnets of opposite polarity. As the subject concentrates on the space, they notice their fingers moving closer together, as if they are magnetized. Not only do the fingers move closer until they touch, but the subject often also feels a pull or attraction between the fingers.