My parents taught me how to do this when I was little. Choose a nice, tall, plantain seed stalk.
Wrap a second stem around the nice, tall one, and pinch. It must be held firmly enough to pop off the seed head when you slide it up the stem, but loose enough to slide.
Now quickly slide the second stem up the first one and pop off the seed head. It should go flying. Sometimes we can shoot it only about three feet. Once we shot it about ten feet, backwards and over our heads!!!! How far can you make it go?