i saw that one years ago saramara.to do the trick you need a little gimmick, in this instance a fake thumb that is slightly larger than your own.first of all you pretend to make a hole in your clenched fist with your thumb but what you are really doing is slipping the fake thumb off.put the (paper thin) hankie in the fist and then slip your thunb back in whilst pretending to push the hankie in.the hankie is then in the fake thumb which is now on yourreal thumb.these thumb and hankie sets can be brought from any magic shop for a couple of pounds.i worked it out by videoing that show and then playing it back in slow motion.hope this helps