Take a newspaper, not too small and not too large.
The measurement 51cm x 35cm (20'' x 14'') is recommended.
 ... | Find the centre line by folding the left side on the right side and by unfolding....................   |
 ... | Fold downward the upper half on the red line and unfold it. ....................................... There are two centre lines now which will be used later. |
 ... | Fold the paper on the four red lines upward, so that four triangles touch the horizontal line......................................................................... |
 ... | It must look like this. |
 ... | Fold on the red line. In other words: Create an isosceles trapezium. |
 ... | It must look like this. |
 ... | Fold on the red line. |
 ... | It must look like this.  |
 ... | Fold the paper backwards on the blue line. |
 ... | It must look like this. |
 ... | Turn through 180°. (The couloured spot tells you what is meant.) The paper banger is finished. |
 ... | Hold the banger between thumb and index finger and bring them down on lightning speed with the whole arm. You hear a loud bang. You have a similar sound if you clap your hands once. |
 ... | One inside layer pops out with the bang. |
Attempt of Explanation:
The air is pressed inside during moving the paper banger downwards and the air suddenly is free when the inner layer is coming out.
It is a small explosion.
Comments top
If you use stiff or thick paper, you don't succeed in moving the inner flap outwards.
For instance the paper used for ink jet printers is unsuitable.
I must admit that the bang is not very loud. In spite of that the paper banger is popular. >You can fold the banger easily and quickly. Children are proud if they know how to make it.
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