Show a Champagne bottle to the audience, as explaining that you will make the bottle vanish by placing it into a paper bag.

You place the bottle into the bag and the turn the bag upside down showing that the bottle has "VANISHED"!

Now you turn the bag right side up and shows that the bottle has appeared again!

Once again you put the bottle in the bag, it vanishes, no one believes this really vanishes.
So you CRUSH the bag with the bottle inside!

Yes the Champagne bottle has VANISHED!