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The Joker Tube Mystery is big and impressive and self working. You are supplied with four balls but you only perform with three. 

Before you begin the trick place the spare red ball in the top of the tube. It will stay up top as it is held by a stopper gimmick.

As you proceed to place the balls in the tube in different ways you will then see the balls change places in different ways. The red one will always look as though it is making its way magically to the bottom.

As long as you place a red ball in last it will always look as though it has melted thru the yellow and green balls.

How does the red ball travel thru the other two balls? Your audience will be wondering how. Never show the inside of the tube.