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10-те най-странни и жестоки научни експеримента. Включва слон на LSD. Съдържа и добър пример на погрешното мислене, че корелацията означава, че има причинно-следствена връзка:
In 1942 Lawrence LeShan, of the College of William and Mary in Williamsburg, Virginia, attempted subliminally to influence boys into stopping biting their fingernails. While they were asleep, he played them a record of a voice saying: “My fingernails taste terribly bitter.” When the record player broke down, he stood in the dormitory repeating the phrase himself.
It seemed to work: by the end of the summer, 40 per cent of the boys had stopped biting their nails. Mr Boese, however, has another explanation: “‘If I stop biting my nails,’ they probably thought, ‘the strange man will go away.’”