: Place your mouth against the paper and blow firmly. The air rushing through the slit will cause the paper to vibrate rapidly, creating a loud "screaming" sound. Alternative: The Paper Popper
: You can find " The Simple Screamer ," a classic guide to papier-mâché, for free streaming on Internet Archive . If you'd like to try a specific style: 15 Second Paper Screamer : 4 Steps - Instructables
: Use a piece of paper about 1 inch wide and 5 inches long (though exact size isn't crucial).