Jumbo Wonder Glass
The magician shows a large glass full of milk or any dark colored liquid. He says that he would like to share it with the spectators. He take another glass for himself and pours all the liquid in it.
Surprisingly, the glass from which it is poured, also remains full of liquid. In a nutshell, he is seen to be holding two glasses full of liquid ! He magician drinks the contents of one glass. He then says that it is very difficult to distribute the other glass among so many spectators. So he resorts to magic.
He asks the audience to imagine that hey are sucking the liquid with a straw. Lots of fun and business can be created here. The liquid from the glass is seen to decrease visibly ! At the end he asks them to stop sucking as he wants to give the little amount left to his assistant.