Fold the sheet of paper down the middle lengthways then unfold.
Cut down just less than half-way down the crease line.
Cut about 1/3 of the way through the paper widthways just below the other cut and fold inwards.
Fold the flaps inwards and secure with a paperclip, this also weights it down.
Fold the top flaps opposite ways and it is ready to use. Simply hold up high, drop and watch it spin.