Take 5 toothpicks
Break one at the middle. Don't break completely, it needs to stay attached.
Repeat with other four.
Arrange them as shown and move the breaks close together at the middle.
Make sure they are fairly even spaced and not overlapping. Then apply a drop of water at the centre. Try to wet all five breaks.
Sit back and watch them slowly open out.
With the right kind of surface, just the right amount of water and a bit of luck, it should end up something like this. :)