Effect: A coloring book is shown to have all blank pages. Suddenly, with a wave of the magicians hand, pictures appear in the book, outlined in black. With audience participation, the magician takes the trick one step further. He colors the pictures – by magic. Now bright, vibrant colors have filled in the black and white pictures!
Wait for someone to take the bait and yell out – “Can you change them back!” And then say, SURE I can! And proceed to reverse the process for a powerful, jaw-dropping finale.