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Someone showed me this with an acorn a few years ago. Once you figure out how to do it well, you can use all sorts of objects to ...
hold your hands so your thumbs are touching like the picture below. Rotate your hands open slightly like you are making a butterfly shadow puppet (see second picture) ...
You want to hold the acorn cap so it is totally sealed all around except for in the "V" shape you made with your thumbs. Please excuse my ...
Press your lower lip gently against your thumbs as shown, your upper lip kind of sits on top. Blow hard. It will probably take a bit to figure ...
In these examples the sound does not do it justice.Good luck
Make a whistle from bottle-tops.by Kiteman
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A Homemade Whistle in less than a Minuteby cammers
Transform a ballpoint pen into a survival whistle mini-penby mistyp
Soda Can Whistleby Dude7070
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