Start with a piece of paper.You don't want to stiff of paper, otherwise it won't work.
Fold it in half, then unfold it.
Fold all of the corners in onto that line you made in the previous step. Then fold it in half on that line.
You'll then want to fold that piece in half and unfold it.
Next fold the corners onto that line.
Lastly fold it outwards so it creates a triangle. Hold it as shown in the second photo, and whip your arm in a downwards motion. It should create a loud pop. As it gets broken in, it usually gets louder. Have fun.