In Debbie' s magic act, a volunteer supposedly selects a card in a random fashion, looks at it without showing it to her, and replaces it in the deck  After several shuffles, Debbie cuts the deck and supposedly reveals the same selected card, A skeptic conducted three trials  In the first, Debbie was videotaped, and no sleight of hand was found  In the second, the skeptic instead supplied a standard deck of cards  For the third trial, the skeptic selected the card  Each time, Debbie apparently revealed the selected card
The skeptic concluded that Debbie uses neither sleight of hand, nor a trick deck, nor a planted volunteer to achieve her effect
The skeptic failed to consider the possibility that Debbie did not always use the same method to achieve her effect.