How To Fold A Banger

1. Fold a rectangle (A3 [29 x 42cm/11 1/2 x 16 1/2in], minimum) in half, bringing the long edges together. Unfold, then fold all four corners inward to lie along the crease just made.

2. Fold the model in half, bottom to top.

3. Fold in half again, bringing the sharp points together.

4. Upper layer only, fold the lower edge back on a diagonal crease to lie along the folded edge created in step 3.

5. Repeat on the reverse face.

How To Use
Hold the banger tightly by the corner that has the two independent sharp points. Make sure that the longest side faces toward you. Hold high in the air, as shown, then bring the whole model down sharply, as if cracking a whip. The inner flap shoots out, producing a loud "bang", To reload, simply refold the banger.