False fingernails can present problems. Some people develop allergies to the adhesive, a variety of Crazy Glue, that is used to afix them. This can result in breathing problems, watery eyes and congestion. The nails are usually made of poly(acrylonitrile-butadiene-styrene), a flammable plastic which has roughly the same flexibility and stiffness as fingernails. At the temperature of a candle flame, this plastic can ignite in a second to produce a fiery ball of molten plastic that sticks to the finger. So be careful with those romantic candle-light dinners.
