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It is not impossible if you were to use some of the methods like the televangelist Jerry Falwell used to use, but I would never use those methods in that manner. There is no magic at all, it is all the power of suggestion, the power of suggestion is so strong that if I told you in a state of somnambulism that my pen was a lit cigarette and you were willing to accept that suggestion, then pressed it to your skin, your skin would begin to bubble up in a way that is indistinguishable from a real burn.