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make this amazingly simple whistle using a crown cap from a coke bottle, balloon and
scissors. you can use a torn balloon, and if you don't have one you can use a new one
and cut it with the scissors. bottom portion will be very useful in this. take bottom portion
of balloon, open it and stretch it very tightly on the mouth of the crown cap. stretch it
tightly and you will find that the notches keep the balloon in place. the middle part
would be stretched or under tension. now place this in your mouth and blow at the top of
this stretched membrane and you will hear a very loud sound.