Question: Seal the ends of a plastic drinking straw.

  Options: 
 A. Take a paper napkin and tear a three inch square from it. Wad that up and get it wet. Make a ball of the square and jam that into the end of the straw.
 B. Hold one end in the fire provided by a small candle. Heat it but do not let it catch fire. Remove from the heat and squish with a pliers. The plastic should be soft enough to melt together.
Answer: B