Only The Magician Can Select The Right Coloured Ball.

Try this easy magic trick. (All you need is a cloth bag and six balls, all different colours.)
A member of the audience selects one coloured ball from a choice of five.
All five coloured balls are placed in a bag, and jumbled.
The audience member has four chances to withdraw his chosen colour, but fails every time.
Only the magician can withdraw the ball first selected.
It won't be noticed that the five colours have changed from those originally shown. The audience's attention is focused on just one colour, which remains throughout the trick.