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This is the second easiest trick that I know. All you need for this neat little trick is a rubber band (hair elastic will work just as well).
Effect: You place a rubber band on two of your fingers and close your hand into a fist. When you open your hand again the elastic has jumped across onto your other two fingers.
Method: Put a rubber band around your first and second finger like in the picture. When you close your fist you secretly pull the elastic and put all your fingers inside the band. Make sure nobody see’s this part. Tell your audience that the rubber band will jump across to your other two fingers. When you open your hand the band will jump across.

Above: This is what it looks like from the front (your audience see’s this side)

When you close your hand you secretly pull the rubber band around your fingers like this. Make sure nobody see’s you doing this!

When you open your hand the rubber band will jump to the other two fingers. This is what it looks like from the front again.