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Picture of A Whistle Out Of A Bottle Cap
Today I am going to teach you how to make a whistle from a bottle cap. This could be very helpful if you were to get lost because whistling takes a lot less effort than shouting. You can also do this on an acorn and if you're really good on a bottle!

Step 1: Formation

Picture of Formation
For the formation you need to hold the cap in your hands and use your thumbs to make a "V". Do not put your thumbs flat on the cap. Make sure you make a small gap instead of a large gap or the air won't flow correctly.