Transform two white sponge balls into one 3D sponge duck right in front of your spectator's eyes.

Can you imagine performing this, and getting wild reactions? The spectator sees the two white sponge balls go in the hand. No doubt about it. The hand is opened, and now there's a 3D sponge duck - can you imagine the shocked looks on their faces? Spectators go WILD with this one, and you're the person who performed the miracle! WOW!