Hospitality in a can!
Pour the complete contents of a can into a glass. Then, place a straw inside the can and take a sip. You know, just to make sure it's empty. But it's not! It now contains a completely different beverage! Finish the trick by pouring the drink into a glass to give your spectators a refreshing experience!
Turn a cocktail shaker upside-down to illustrate that it is empty. Place the lid on the shaker and shake as if mixing a cocktail. Take the lid off and pour a cocktail for you and a friend.
Use any can