box of buttons
large vacuum tubing (or some thick woolen stockings)
two coffee can lids
air (room temperature)
pipe cleaners (not strictly necessary, but fun)
Instructions: Mix ingredients in large bowl, or pour into a cardboard box and shake about.
Bake for 30 minutes in a large oven.
Paint tubing black (traditional), or bright colors and stripes.
Tune to the guy next to you.