Cut two slots in the circle as shown here. Cut two strips of the aluminum foil, three inches long by one-half inch wide. Thread each one through a slot and bend it at the top as shown above. Tape the circle over the jar mouth with the strips hanging downward. Charge your comb by combing your hair, rubbing the comb on a carpet, or rubbing it on dry wool or acrylic cloth.
Electricity is a powerful force.
Check this out for an explanation of what's really happening with those jumping electrons. Cool Science 2000-2001. All rights reserved.