Hi!....I begin by classic palming the gaffed English penny, and display the half dollar and English penny in my other hand.
I put down the half-dollar making no comment about it and hand them the real English penny to look at, saying something like,
"have you ever seen one of these before?....then explain to them a bit about the pence and two pence (make a comment on its size- their coin compared to ours) while I take the coin back from them and put it into my other hand (actually palming the real one I just took back)....so now I'm set to go, I put my hand in my pocket while talking to dispose of the real penny. I explain to them that this effect uses two coins- which i display holding one coin in each by the fingers and turning my hands over (let's them see both sides but I draw no attention to it) in my hand and then close my hand. Then I simply say ,"watch what happens when I take away the half dollar"....I do so...."it pops right back into my hand"....I show them the 2 coins, I display the two coins as before held between my fingers. I keep up the "watch what happens.....keeps on popping back"....until I get to the finale. "I'll do this one more time again showing both coins held between fingers) and I put the coin in my pocket. "This time you'll feel it popping back into your hands." I ask them to hold both their hands open under mine- and to their amazement there are no coins......(sometimes when I say I'll put he coin in mypocket, when its the 2 sided coin I'll just start to put the coin into my pocket without showing them then say "no I really have the coin- and it to them)............Michael