The performer pushes a colored silk into his left closed hand. He blows and look! The silk has turned into an egg.
Offering to explain the trick he shows that the egg is hollow and has a hole at one side and that is where the silk goes.
Once again you repeat the trick and again it changes into an egg. The audience laugh because they know the secret but they'll be shock when the magician brakes the egg into a glass showing it was a real egg.