Talk about your interest in voodoo and how it is easy to perform voodoo on someone using your phone.
Show them the gallery of pictures of black magic and voodoo, and end up stopping on the picture of our voodoo doll.
Leave the phone on a table. You will never touch the phone again and it’s now when the trick really starts. Talk about the main six parts of the body where voodoo can injure a person: head, heart, stomach, hands, legs and... genitals.
Ask someone to choose a person of the audience and to point at one of his or her body parts. Once he or she chooses a body part, ask them to pick up the phone and the voodoo doll will scare them by nailing a needle on the part that he or she has chosen.