Whistle with an acorn from a tree. This creates a really loud whistle that uses the acorn to make it louder than you could ever blow with just your tongue or fingers. This is similar to the principle of a grass. Put the acron shell between your two thumbs

Put your thumb knuckles over the acorn in a V shape about 4/5 up the acorn, being sure to leave about half a centimeter of uncoverved space.Now put your lips over your knuckles, one below and one above, and then blow as hard as you can.

How to Whistle Using an Acorn Cap. Whistling with acorns is a trick that is easy to learn and teach, plus, it is very effective at getting attention and amazement from friends. Additionally, it can save your life if you are lost in the...